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Subject: Conservation & Mitigation

1. Conservation Progs.
2. Worldwide initiatives
3. Mitigation Strategies
4. Conventions and Protocols

  • Environment Protection Act (EPA), 1986

    The Union Environment Ministry proposes to soften the provisions of the EP Act (EPA) by replacing a clause that provides for imprisoning violators with one that only requires them to pay a fine.

    Environment Protection Act (EPA), 1986

    • EP Act was passed under Article 253 of the Constitution, which empowers the Centre to enact laws to give effect to international agreements signed by the country.
    • The purpose of the Act is to implement the decisions of the UN Conference on the Human Environment.
    • They relate to the protection and improvement of the human environment and the prevention of hazards to human beings, other living creatures, plants and property.
    • It was enacted in 1986 on the backdrop of Bhopal Gas Tragedy.
    • The Act was last amended in 1991.

    Why this Act?

    • The Act is an “umbrella” legislation that has provided a framework for the environmental regulation regime in India.
    • It covers all major industrial and infrastructure activities and prohibits and regulates specific activities in coastal areas and eco-sensitive areas.
    • The Act also provides for coordination of the activities of various central and state authorities established under other environment-related laws, such as the Water Act and the Air Act.

    Key provisions

    • The Environment (Protection) Rules lay down procedures for setting standards of emission or discharge of environmental pollutants.
    • The objective of Hazardous Waste (Management and Handling) Rules, 1989 is to control the generation, collection, treatment, import, storage, and handling of hazardous waste.
    • The Manufacture, Storage, and Import of Hazardous Rules define the terms used in this context, and sets up an authority to inspect, once a year.
    • The Cells Rules,1989 were introduced with a view to protect the environment, nature, and health in connection with the application of gene technology and micro-organisms.

     

    Try this PYQ:

    Q. Consider the following statements:

    The Environment Protection Act, 1986 empowers the Government of India to

    1. State the requirement of public participation in the process of environmental protection, and the Procedure and manner in which it sought.
    2. Lay down the standards for emission or discharge of environmental pollutants from various sources.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2

     

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  • Enforcing the Single-Use Plastic Ban

    A ban on the use of single-use plastics that was notified by the Union Environment Ministry on August 2021 came into effect on July 1 this year.

    What is the news?

    • The national and State-level control rooms would be set up to check illegal manufacture, import, stocking, distribution, sale and use of banned single use plastic items.
    • The Plastic Waste Management Amendment Rules, 2021, will also prohibit manufacture, import, stocking, distribution, sale and use of plastic carry bags.
    • This is for plastics having thickness less than 120 microns with effect from December 31, 2022.

    What is Single-Use Plastic?

    • The Centre defines it as an object made of plastic that is intended to be used “only once” before being disposed off or recycled.
    • Single-use plastic items such as these had “low utility and high littering potential,” it noted.

    What is now included in SUPs?

    • For the purposes of the ban, there is a list of 21 items that come under the definition of single-use plastic including ear buds with plastic sticks, plastic sticks for balloons, plastic flags, candy sticks, ice-cream sticks, thermocol for decoration etc.
    • It also includes plates, cups, glasses, cutlery such as forks, spoons, knives, straw, trays, wrapping or packing films around sweet boxes, invitation cards, and cigarette packets, plastic or PVC banners less than 100 microns, stirrers.
    • These objects were listed by the Environment Ministry in August when it notified the Plastic Waste Management Amendment Rules, 2021.

    How will the ban be implemented?

    • So far 32 States/UTs have reportedly constituted a dedicated Task Force to eliminate the use of single-use plastics.
    • Of these 14 states/UTs and 12 Central Ministries, as of March, had developed action plans describing how they would be enforcing this.
    • A few States, for example Maharashtra, already have legislation banning the manufacture and storage of such plastic.
    • But implementing it wasn’t always successful as there was regular supply from States where such bans were not in force.
    • An all-India ban, it’s hoped, would make enforcement more effective.

    Penal provisions

    • According to the Environment Protection (EP) Act, violating the ban could invite “punitive action”.
    • Manufacturers and distributors of single-use plastic goods were directed to have zero inventory by June 30.
    • The EP Act says that violating the ban could invite a five-year imprisonment and a fine of upto ₹1 lakh, or both.
    • If the violations are repeated, it could mean additional fines up to ₹5000 for each day.
    • There are different penalties for companies, organisations, and government departments under the EP Act.

    What is the history of the single use plastic ban in India?

    • The Environment Ministry told the Rajya Sabha last July of its plan to phase out some categories of single use plastic by 2022.
    • A draft outlining the manner in which the ban was to be implemented was issued in March and involved amending the PWM Rules, 2016.
    • Before the amendments came into force, the Rules only prohibited the manufacture, import, stocking, distribution, sale and use of carry bags and plastic sheets less than 50 microns in thickness in the country.
    • There is a ban on sachets using plastic material used for storing, packing or selling gutkha, tobacco and pan masala.
    • Since October 2021, there is a ban on carry bags made of virgin or recycled plastic less than 75 microns as opposed to 50 microns under the earlier version of the rules.

    Is there popular support for the ban?

    • The All India Plastic Manufacturers Association has said that the ban would shutter 88,000 units in the plastic manufacturing business.
    • These employ close to a million people and contribute to exports worth ₹25,000 crore.
    • Fast Moving Consumer Goods companies (FMCG) would be severely affected by the the ban due to their dependence on plastic straws, plates.
    • Their replacements, industry representatives say, are available but cost much more than their plastic alternatives.
    • There is also limited capacity in India to provide biodegradable replacements.

    What is the environmental damage from SUPs?

    • Unlike thicker and denser plastic material, single-use plastic objects being light and flexible are less amenable to being recycled.
    • While 99% of plastic is recycled, they constitute heavier plastics that are likely to be collected by ragpickers and plastic waste recyclers.
    • Single use plastics do not provide an incentive enough for the effort needed to collect them and hence they lie around, leach their toxins into the soil and cause environmental damage in both land and sea.

     

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  • Species in news: Chenkurinji

    This newscard is an excerpt from the original article published in The Hindu.

    Chenkurinji

    • Chenkurinji (Gluta travancorica) is a species endemic to the Agasthyamala Biosphere Reserve.
    • Belonging to the Anacardiaceae family, the tree was once abundant in the hills on the southern parts of the Aryankavu Pass in Kerala’s Kollam district.
    • The Shendurney Wildlife Sanctuary derives its name Chenkurinji (Gluta travancorica), a species endemic to the Agasthyamala Biosphere Reserve.

    Why in news?

    • It is very susceptible to climate change and the present condition of the species is quite bad with low regeneration performance.
    • Though there are seemingly enough number of the tree, most are not productive, generating a negative trend in its population.
    • The majority of the trees is old with poor flowering and fruiting rates.
    • Though the flowering usually happens in January, of late, the species has reported a tendency to extend the process due to climate change.

    Significance of Chenkurinji

    • It is reported to have medicinal properties and is used to lower blood pressure and treat arthritis.

     

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  • What are Eco-Sensitive Zones (ESZ)?

    Farmers in Kerala continue to protest across several high ranges of the state against the Supreme Court’s recent order to establish 1-km Eco-Sensitive Zones around all protected areas, wildlife sanctuaries, and national parks.

    What are the Eco-sensitive Zones (ESZs)?

    • Eco-Sensitive Zones (ESZs) or Ecologically Fragile Areas (EFAs) are areas notified by the MoEFCC around Protected Areas, National Parks and Wildlife Sanctuaries.
    • The purpose of declaring ESZs is to create some kind of “shock absorbers” to the protected areas by regulating and managing the activities around such areas.
    • They also act as a transition zone from areas of high protection to areas involving lesser protection.

    How are they demarcated?

    • The Environment (Protection) Act, 1986 does NOT mention the word “Eco-Sensitive Zones”.
    • However, Section 3(2)(v) of the Act, says that Central Government can restrict areas in which any industries, operations or processes or class of industries, operations or processes shall be carried out or shall not, subject to certain safeguards.
    • Besides Rule 5(1) of the Environment (Protection) Rules, 1986 states that central government can prohibit or restrict the location of industries and carrying on certain operations or processes on the basis of certain considerations.
    • The same criteria have been used by the government to declare No Development Zones (NDZs).

    Defining its boundaries

    • An ESZ could go up to 10 kilometres around a protected area as provided in the Wildlife Conservation Strategy, 2002.
    • Moreover, in the case where sensitive corridors, connectivity and ecologically important patches, crucial for landscape linkage, are beyond 10 km width, these should be included in the ESZs.
    • Further, even in the context of a particular Protected Area, the distribution of an area of ESZ and the extent of regulation may not be uniform all around and it could be of variable width and extent.

    Activities Permitted and Prohibited

    • Permitted: Ongoing agricultural or horticultural practices, rainwater harvesting, organic farming, use of renewable energy sources, and adoption of green technology for all activities.
    • Prohibited: Commercial mining, saw mills, industries causing pollution (air, water, soil, noise etc), the establishment of major hydroelectric projects (HEP), commercial use of wood, Tourism activities like hot-air balloons over the National Park, discharge of effluents or any solid waste or production of hazardous substances.
    • Under regulation: Felling of trees, the establishment of hotels and resorts, commercial use of natural water, erection of electrical cables, drastic change of agriculture system, e.g. adoption of heavy technology, pesticides etc, widening of roads.

    What is the recent SC judgment that has caused an uproar in Kerala?

    • On June 3, a three-judge bench of the Supreme Court heard a PIL that sought to protect forest lands in the Nilgiris in Tamil Nadu, but was later expanded to cover the entire country.
    • In its judgment, the court while referring to the 2011 guidelines as “reasonable”, directed all states to have a mandatory 1-km ESZ from the demarcated boundaries of every protected area.
    • It also stated that no new permanent structure or mining will be permitted within the ESZ.
    • If the existing ESZ goes beyond 1-km buffer zone or if any statutory instrument prescribes a higher limit, then such extended boundary shall prevail, the court, as per the Live Law report, said.

    Why are people protesting against it?

    • There is a high density of human population near the notified protected areas.
    • Farmer’s groups and political parties have been demanding that all human settlements be exempt from the ESZ ruling.
    • The total extent of the wildlife sanctuaries in Kerala is eight lakh acres.
    • If one-km of ESZ is demarcated from their boundaries, around 4 lakh acres of human settlements, including farmlands, would come within that purview.

    Try this PYQ

    With reference to ‘Eco-Sensitive Zones’, which of the following statements is/are correct?

    1. Eco-Sensitive Zones are the areas that are declared under the Wildlife (Protection) Act, 1972
    2. The purpose of the declaration of Eco-Sensitive Zones is to prohibit all kinds of human activities, in those zones except agriculture.

    Select the correct answer using the code given below:

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2

     

     

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  • Land Degradation

    Context

    A key element of sustainable food production is healthy soil because nearly 95 per cent of global food production depends on soil. The current status of soil health is worrisome.

    The threat posed by soil degradation

    • The challenge to food security: Soil degradation on an unprecedented scale is a significant challenge to sustainable food production.
    • About one-third of the earth’s soils is already degraded and alarmingly, about 90 per cent could be degraded by 2050 if no corrective action is taken.
    • Soil degradation in India: While soil degradation is believed to be occurring in 145 million hectares in India, it is estimated that 96.40 million hectares — about 30 per cent of the total geographical area — is affected by land degradation.
    • The FAO’s latest ‘State of the World’s Land and Water Resources for Food and Agriculture’ says: “…soil pollution is also an issue. It knows no borders and compromises the food we eat, the water we drink and the air we breathe.
    • Globally, the biophysical status of 5,670 million hectares of land is declining, of which 1,660 million hectares (29 per cent) is attributed to human-induced land degradation, according to the Food and Agriculture Organisation’s ‘State of Land, Soil and Water’ report.

    Cause of the problem

    • Use of agrochemicals: The excessive or inappropriate use of agrochemicals is one cause of the problem.
    • The global annual production of industrial chemicals has doubled since the beginning of the 21st century, to approximately 2.3 billion tonnes.
    • Extensive use of fertilisers and pesticides led to the deterioration of soil health and contamination of water bodies and the food chain, which pose serious health risks to people and livestock.
    • Salination: Another challenge comes from salinisation, which affects 160 million hectares of cropland worldwide.”

    About Soil Health Card Scheme

    • Soil Health Card (SHC) scheme is promoted by the Department of Agriculture & Co-operation under the Ministry of Agriculture and Farmers’ Welfare.
    • An SHC is meant to give each farmer soil nutrient status of his/her holding and advice him/her on the dosage of fertilizers and also the needed soil amendments, that s/he should apply to maintain soil health in the long run.
    • SHC is a printed report that a farmer will be handed over for each of his holdings.
    • It will be made available once in a cycle of 2 years, which will indicate the status of soil health of a farmer’s holding for that particular period.
    • The SHC given in the next cycle of 2 years will be able to record the changes in the soil health for that subsequent period.
    • Under the programme as of date, soil health cards have been distributed to about 23 crore farmers.
    • The scheme has not only helped in improving the health of the soil, but has also benefited innumerable farmers by increasing crop production and their incomes.

    Progress made so far on soil restoration

    • India is well on course to achieving the restoration of 26 million hectares of degraded land by 2030.
    • A study conducted by the National Productivity Council in 2017 on this programme revealed that there has been a decrease in the use of chemical fertilisers in the range of 8-10 per cent as a result of the application of fertilisers and micro-nutrients as per the recommendations on the soil health cards.
    • Overall, an increase in crop yields to the tune of 5-6 per cent was reported as a result.
    • First organic state in the world: “A Healthy Planet for Healthy Children’’ published by the United Nations Institute for Training and Research and the World Future Council highlighted success stories from various countries — including Sikkim in India, which became the first organic state in the world.

    Way forward

    • Natural farming: Several studies have established that natural farming and organic farming are not only cost-effective but also lead to improvement in soil health and the farmland ecosystem.
    • Agro-ecological practices: With the threat to food security looming large globally, the need of the hour is to adopt innovative policies and agro-ecological practices that create healthy and sustainable food production systems.

    Conclusion

    The time has come for collective global action involving governments and civil society to reverse the alarming trend of soil degradation.

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  • Bedti-Varada Interlinking Project

    Environmental groups in Karnataka have criticised the project to link the Bedti and Varada rivers in Karnataka, calling it ‘unscientific’ and a ‘waste of public money’.

    Bedti-Varada Interlinking Project

    • The Bedti-Aghanashini-Varade river-linking project was also included in the country’s major rivers project devised by the then PM Vajpayee government.
    • The Central Government had created a task force to prepare action plans for interlinking the riverbeds in 2002.
    • The project cost and the source of investments were ascertained and suggested that the project be taken up in 2016.

    Key details

    • The Bedti-Varada project was envisaged in 1992 as one to supply drinking water by the then government.
    • The plan aims to link the Bedti, a river flowing west into the Arabian Sea, with the Varada, a tributary of the Tungabhadra river, which flows into the Krishna, which in turn flows into the Bay of Bengal.
    • A massive dam will be erected at Hirevadatti in Gadag district under the project. A second dam will be built on the Pattanahalla river at Menasagoda in Sirsi, Uttara Kannada district.
    • Both dams will take water to the Varada via tunnels of length 6.3 kilometres and 2.2-km. The water will reach at a place called Kengre.
    • It will then go down a 6.88 km tunnel to Hakkalumane, where it will join the Varada.
    • The project thus envisages taking water from the water surplus Sirsi-Yellapura region of Uttara Kannada district to the arid Raichur, Gadag and Koppal districts.

     

     

  • Places in news: Keibul Lamjao National Park (KLNP)

    Activists surrounding the Keibul Lamjao National Park (KLNP) in Manipur have now taken up the cudgels to ensure that the government does not shift the proposed heritage park from the approved site.

    Keibul Lamjao National Park (KLNP)

    • The KLNP is a national park in the Bishnupur district of the state of Manipur in India.
    • It is 40 km2 in area, the only floating park in the world, located in North East India, and an integral part of Loktak Lake.
    • The national park is characterized by floating decomposed plant material locally called Phumdi at the south–eastern side of the Loktak Lake, which has been declared a Ramsar site.
    • It was created in 1966 as a wildlife sanctuary to preserve the natural habitat of the endangered Eld’s deer.
    • In 1977, it was gazetted as national park.

    Key faunas

    • KLNP is home to the last of the brow-antlered deer (Rucervus eldii eldii), one of the most endangered deer in the world.
    • It is locally called as Sangai.
    • The animal is, in fact, in danger of losing its home—most of the phumdis, or floating swamps, are unable to sustain its weight.
    • In 1951, it was reported extinct, but British tea planter and naturalist Edward Pritchard Gee rediscovered it in 1953.

     

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  • single-use plastic

    The Centre has banned the use of ‘single-use plastic’ from July 1.

    What is the news?

    • The Ministry for Environment, Forest and Climate Change had issued a gazette notification last year announcing the ban, and has now defined a list of items that will be banned from next month.
    • The manufacture, import, stocking, distribution, sale and use of suc plastic, including polystyrene and expanded polystyrene, commodities shall be prohibited with effect from the 1st July, 2022.

    What is Single-Use Plastic?

    • As the name suggests, it refers to plastic items that are used once and discarded.
    • Single-use plastic (SUP) has among the highest shares of plastic manufactured and used — from packaging of items, to bottles (shampoo, detergents, cosmetics), polythene bags, face masks, coffee cups, cling film, trash bags, food packaging etc.
    • It accounts for a third of all plastic produced globally, with 98% manufactured from fossil fuels.
    • SUP also accounts for the majority of plastic discarded – 130 million metric tonnes globally in 2019 all of which is burned, buried in landfills or discarded directly into the environment.
    • On the current trajectory of production, it has been projected that single-use plastic could account for 5-10% of greenhouse gas emissions by 2050.

    SUPs in India

    • India features in the top 100 countries of single-use plastic waste generation – at rank 94 (the top three being Singapore, Australia and Oman).
    • With domestic production of 11.8 million metric tonnes annually, and import of 2.9 MMT, India’s net generation of single-use plastic waste is 5.6 MMT, and per capita generation is 4 kg.

    What are the items being banned?

    • According to the Plastic Waste Management Rules, 2016, there is also a complete ban on sachets using plastic material for storing, packing or selling gutkha, tobacco and pan masala.
    • The items on which the Central Pollution Control Board (CPCB) have announced a ban are earbuds; balloon sticks; candy and ice-cream sticks; cutlery items including plates, cups, glasses, forks, spoons, knives, PVC banners measuring under 100 microns among others.
    • The Ministry had already banned polythene bags under 75 microns in September 2021, expanding the limit from the earlier 50 microns.
    • From December, the ban will be extended to polythene bags under 120 microns.
    • The ban is being introduced in phases to give manufacturers time to shift to thicker polythene bags that are easier to recycle.
    • While manufacturers can use the same machine for 50- and 75-micron bags, the machinery will need to be upgraded for 120 microns.

    Why these items?

    • The choice for the first set of SUPs items for the ban was based on difficulty of collection, and therefore recycling.
    • The enemy is not that plastic exists per se, but that plastic exists forever in the environment.
    • When plastic remains in the environment for long periods of time and does not decay, it turns into microplastics – first entering our food sources and then the human body, and this is extremely harmful.
    • These items are difficult to collect, especially since most are either small, or discarded directly into the environment – like ice-cream sticks.
    • It then becomes difficult to collect for recycling, unlike the much larger items.
    • The largest share of SUP is that of packaging – with as much as 95% of single use belong to this category – from toothpaste to shaving cream to frozen foods.
    • The items chosen are of low value and of low turnover and are unlikely to have a big economic impact, which could be a contributing reason.

    How will the ban be enforced?

    • The ban will be monitored by the CPCB from the Centre, and by the State Pollution Control Boards (SPCBs) that will report to the Centre regularly.
    • Directions have been issued at national, state and local levels — for example, to all petrochemical industries — to not supply raw materials to industries engaged in the banned items.
    • Directions have also been issued to SPCBs and Pollution Control Committees to modify or revoke consent to operate issued under the Air/Water Act to industries engaged in SUP items.
    • Last week, the CPCB issued one-time certificates to 200 manufacturers of compostable plastic and the BIS passed standards for biodegradable plastic.

    What if violation occurs?

    • Those found violating the ban can be penalised under the Environment Protection Act 1986 – which allows for imprisonment up to 5 years, or a penalty up to Rs 1 lakh, or both.
    • Violators can also be asked to pay Environmental Damage Compensation by the SPCB.
    • In addition, there are municipal laws on plastic waste, with their own penal codes.

    How are other countries dealing with single-use plastic?

    • Bangladesh became the first country to ban thin plastic bags in 2002.
    • New Zealand became the latest country to ban plastic bags in July 2019.
    • China issued a ban on plastic bags in 2020 with phased implementation.
    • As of July 2019, 68 countries have plastic bag bans with varying degrees of enforcement.
    • Vanuatu and Seychelles have banned plastic straws outright.

     

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  • Explained: Occurrence of Lightning

    At least 70 people died in lightning strikes across Uttar Pradesh, Madhya Pradesh and Rajasthan.

    What is lightning?

    • Scientifically, lightning is a rapid and massive discharge of electricity in the atmosphere some of which is directed towards earth.
    • The discharges are generated in giant moisture-bearing clouds that are 10-12 km tall.
    • The base of these clouds typically lie within 1-2 km of the Earth’s surface, while the top is 12-13 km away.
    • Temperatures in the top of these clouds are in the range of –35° to –45°C.

    Its formation

    • As water vapour moves upward in the cloud, the falling temperature causes it to condense.
    • As they move to temperatures below 0°C, the water droplets change into small ice crystals.
    • They continue to move up, gathering mass until they are so heavy that they start to fall to Earth.
    • This leads to a system in which, simultaneously, smaller ice crystals are moving up and bigger crystals are coming down.
    • Collisions follow and trigger the release of electrons, a process that is very similar to the generation of sparks of electricity.
    • As the moving free electrons cause more collisions and more electrons, a chain reaction ensues.
    • This process results in a situation in which the top layer of the cloud gets positively charged, while the middle layer is negatively charged.
    • The electrical potential difference between the two layers is huge, of the order of a billion to 10 billion volts.
    • In very little time, a massive current, of the order of 100,000 to a million amperes, starts to flow between the layers.

    Types of lightning

    • Broadly, there are three forms of lightning:
    1. Inter-cloud
    2. Intra-cloud
    3. Cloud-to-ground
    • It is the cloud-to-ground form of lightning that kills humans, as well as animals and livestock, and can substantially damage property.
    • While the Earth is a good conductor of electricity, it is electrically neutral.
    • However, in comparison to the middle layer of the cloud, it becomes positively charged.
    • As a result, about 15%-20% of the current gets directed towards the Earth as well.
    • It is this flow of current that results in damage to life and property on Earth.

    How intensely does it strike?

    • A typical lightning flash is about 300 million volts and 30,000 amps.
    • To put it in perspective, household current is 120 volts and 15 amps.
    • A flash of lightning is enough to light a 100-watt incandescent bulb for about three months.

    Why does lightning kill so many people in India?

    • The reason for the high number of deaths is due to people being caught unawares and more than 70% of fatalities happened due to people standing under isolated tall trees.
    • About 25 per cent of the people were struck in the open.
    • Also, lightning is the direct promulgation of climate change extremities.

    Mitigating lightning incidents

    • Lightning is not classified as a natural disaster in India.
    • But recent efforts have resulted in the setting up of an early warning system that is already saving many lives.
    • More than 96% of lightning deaths happen in rural areas.
    • As such, most of the mitigation and public awareness programmes need to focus on these communities.
    • Lightning protection devices are fairly unsophisticated and low-cost. Yet, their deployment in the rural areas, as of now, is extremely low.
    • States are being encouraged to prepare and implement lightning action plans, on the lines of heat action plans.
    • An international centre for excellence on lightning research to boost detection and early warning systems is also in the process of being set up.

     

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  • Theri Desert in Tamil Nadu

    Most of us may not know the small desert situated in the state of Tamil Nadu. It consists of red sand dunes and is confined to the Thoothukudi district.

    Theri Desert

    • The red dunes are called theri in Tamil.
    • They consist of sediments dating back to the Quaternary Period and are made of marine deposits.
    • They have very low water and nutrient retention capacity.
    • The dunes are susceptible to aerodynamic lift.
    • This is the push that lets something move up. It is the force that is the opposite of weight.

    Mineral composition of Theris

    • The analysis of the red sand dunes reveal the presence of heavy and light minerals.
    • These include Ilmenite, Magnetit, Rutile, Garnet, Zircon, Diopside, Tourmaline, Hematite, Goethite, Kyanite, Quartz, Feldspar, Biotite.
    • The iron-rich heavy minerals like ilmenite, magnetite, garnet, hypersthene and rutile present in the soil had undergone leaching by surface water.
    • They were then oxidised because of the favourable semi-arid climatic conditions.

    How did they form?

    • Theris appear as gentle, undulating terrain.
    • The lithology of the area shows that the area might have been a paleo (ancient) coast in the past.
    • The presence of limestone in many places indicates marine transgression.
    • The present-day theris might have been formed by the confinement of beach sand locally, after regression of the sea.
    • When high velocity winds from the Western Ghats blew east, they induced migration of sand grains and accumulation of dunes.

    Another story of their formation

    • Another view is that these are geological formations that appeared in a period of a few hundred years.
    • The red sand is brought from the surface of a broad belt of red loam in the plains of the Nanguneri region (about 57 kilometres) by south west monsoon winds during May-September.
    • The winds after draining the moisture behind the Mahendragiri hill and the Aralvaimozhi gap of the Western Ghats become dry and strike the plains in the foothills, where vegetation is sparse.
    • Deforestation and the absence of vegetative cover in the Aralvaimozhi gap and the Nanguneri plains are considered to be the major causes of wind erosion.

     

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