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Subject: Science and Technology

  • [3rd October 2024] The Hindu Op-ed: A case of nothing but patent censorship

    PYQ Relevance:

    Q). Discuss Section 66A of IT Act, with reference to its alleged violation of Article 19 of the Constitution. (UPSC CSE 2013)

    Q). What do understand by the concept “freedom of speech and expression”? Does it cover hate speech also? Why do films in India stand on a slightly different plane from other forms of expression? Discuss. (UPSC CSE 2014)

    Mentor’s Comment:  Today’s editorial discusses the limitations and importance of free speech, emphasizing that while individuals have the right to express their opinions without fear of retaliation, this right is not absolute. Key restrictions include defamation, obscenity, and incitement to violence. The article highlights that the government cannot arbitrarily decide what constitutes acceptable speech, as outlined in Article 19(2) of the Constitution. It also notes that free speech serves both instrumental purposes, like fostering better politics, and intrinsic values, such as recognizing individual dignity. However, the government’s attempt to control narratives about its actions can lead to censorship, undermining democratic principles.

    _

    Let’s learn!

    Why in the News?

    Bombay HC ruled against an amendment to the IT Rules, declaring it unconstitutional and upholding free speech rights.

    • It emphasized that while misinformation is a concern, any regulatory measures must align with constitutional rights, particularly Articles 14 and 19, which protect equality and freedom of speech.
    Constitutional Provisions on Free Speech:

    • Free speech in our legal system is based on the principle that the state should not decide what expressions are acceptable.
    • Article 19(2) of the Constitution outlines specific restrictions, such as defamation and national security.
    • The right to free speech, guaranteed by Article 19(1)(a), is essential for informed political discourse and recognizes citizens’ dignity and autonomy.

    What did the IT Rules (2021) say?

    • Rule 3(1)(b)(v) of the new Information Technology (Intermediary Guidelines and Digital Media Ethics Code) Rules, 2021 imposes strict obligations on internet intermediaries, such as service providers and social media platforms.
    • If the government’s “Fact Check Unit” labels any reporting about its activities as false, these companies must take steps to avoid hosting that content.
    • Failing to comply could result in losing their “safe harbor” protection from legal liability under the IT Act, 2000, which safeguards free expression.
    • Section 79 of the IT Act provides a legal shield for intermediaries (safe harbour), such as social media platforms, by protecting them from liability for content posted by third parties, as long as they take reasonable steps to comply with the law.

    Various views presented through the ‘Petition and Response’:

    • According to the Petitioners’ argument, Rule 3(1)(b)(v) breaches protections for free speech and the State wrongly claims authority to define “fake” information, ignoring less intrusive solutions.
    • However, the Union Government responded that the law is not coercive and that intermediaries can contest safe harbor losses. While no Constitutional protections are given for false information, regulation of online expression is within government powers.
    • As per the Judicial opinion, Rule 3(1)(b)(v) is ultra vires, vague, overbroad, and chilling to free speech. Further, the loss of safe harbour does not threaten free expression.

    Present Issue over the Intermediaries and Safe Harbour

    • On Intermediaries: Under Rule 3(1)(b)(v), if the government’s “Fact Check Unit” informs an intermediary that certain information about the government is ‘false’, the intermediary faces a difficult choice: they can either remove the flagged content or defend the user’s right to express their opinion, risking their safe harbour protection in the process.
      • Here, the intermediaries often prioritize their business interests over the user rights.
      • They may choose to remove content rather than risk losing their legal protections, effectively sacrificing users’ freedom of expression for their own safety.
    • On Safe Harbour: Intermediaries can lose the protection under Section 79 of the IT Act if they are aware of illegal activities occurring on their platforms or receive notifications from government agencies about such activities.
      • Platforms like Facebook, X (formerly Twitter), and WhatsApp serve primarily as hosts for user-generated content.
      • They do not create this content themselves, which allows them to promote free speech without bearing the same responsibilities as traditional publishers.
    • Its limitations: True free speech depends on various factors, including access to resources and social dynamics, which can hinder individuals from expressing themselves fully.

    Conclusion: While free speech can be reasonably limited, there is no constitutional basis for restricting false or misleading information. The government’s attempt to control narratives about its actions represents censorship and undermines democratic principles, as recognized by the Bombay High Court.

  • What are Psychedelic Drugs?

    Why in the News?

    Researchers from the Tata Institute of Fundamental Research (TIFR) in collaboration with researchers from Cornell, Yale, and Columbia has uncovered how a psychedelic drug interacts with the brain to alleviate anxiety.

    About Psychedelic Drugs

    • Psychedelic drugs are a class of psychoactive substances that alter perception, mood, and cognitive processes. 
    • These drugs often induce hallucinations, altered states of consciousness, and enhanced sensory experiences.
    • They are typically associated with spiritual experiences and have historically been linked with counterculture movements, but they are now being studied for their potential in medical therapies.
    • Examples of Psychedelic Drugs:
      • LSD (Lysergic acid diethylamide): Known for causing intense visual hallucinations and altering thoughts, it is one of the most potent psychedelics.
      • Psilocybin: The active compound found in magic mushrooms, known for creating visual and auditory hallucinations, as well as a deep sense of connection to the environment.
      • MDMA (3,4-methylenedioxymethamphetamine): Often associated with recreational use, but is also being researched for its therapeutic potential, especially in treating PTSD.
      • DMT (Dimethyltryptamine): Produces powerful, short-lived hallucinatory experiences, sometimes referred to as the “spirit molecule.”
      • Mescaline: Found in the peyote cactus, mescaline induces hallucinations and altered states of reality.

    How do they work?

    Psychedelics primarily affect the brain by interacting with the serotonin system, a network of neurotransmitters involved in regulating mood, perception, and cognition.

    • Serotonin Receptors: Psychedelics like LSD and psilocybin bind to 5-HT2A receptors, a type of serotonin receptor. This interaction leads to altered perception, enhanced mood, and hallucinations.
    • Brain Connectivity: They increase communication between different regions of the brain, breaking down normal patterns of activity. This leads to heightened creativity, altered sensory experiences, and a sense of connectedness.

    How Psychedelics hold promise for treating Anxiety and Depression?

    • Resetting Neural Circuits: Psychedelics may “reset” dysfunctional brain circuits, helping treat mood disorders.
    • Reduced Anxiety: They reduce overthinking by dampening activity in the brain’s default mode network.
    • Emotional Release: Patients experience emotional breakthroughs during psychedelic therapy sessions.
    • Neuroplasticity: Psychedelics may promote adaptive brain connections, aiding in recovery from chronic stress and depression.
    PYQ:

    [2018] India’s proximity to two of the world’s biggest illicit opium-growing states has enhanced her internal security concerns. Explain the linkages between drug trafficking and other illicit activities such as gunrunning, money laundering and human trafficking. What countermeasures should be taken to prevent the same? (250 Words, 15 Marks)

  • Fluorescent Nano-Diamonds (FND)

    Why in the News?

    Scientists at Purdue University have figured out how to levitate and spin Fluorescent Nanodiamonds (FNDs) in a vacuum.

    What are FNDs?

    • Fluorescent Nanodiamonds (FNDs) are stable, non-toxic carbon nanoparticles that emit consistent fluorescence, have a lifespan over 10 nanoseconds, and can be levitated and spun for advanced quantum research applications.

    What are their Applications?

    • Medical Diagnostics: FNDs are used for high-resolution imaging and tracking cells over extended periods due to their non-toxic nature.
    • Temperature Sensing: FNDs can measure temperatures at the microscale, making them useful for scientific experiments.
    • Correlative Microscopy: Their fluorescent properties make them ideal for combining different types of imaging techniques.
    • Sensor Technologies: Due to their sensitivity to acceleration and electric fields, FNDs can be used in industry sensors and gyroscopes for rotation sensing.
    • Quantum Computing: FNDs doped with nitrogen can be used for quantum superposition experiments and future quantum computing applications.

    PYQ:

    [2022] Which one of the following is the context in which the term “qubit” is mentioned?

    (a) Cloud Services

    (b) Quantum Computing

    (c) Visible Light Communication Technologies

    (d) Wireless Communication Technologies

  • BRCA Testing

    Why in the News?

    Angelina Jolie’s case highlighted hereditary breast and ovarian cancer (HBOC) after she underwent preventive surgeries due to a BRCA1 gene mutation.

    What is BRCA Testing?

    • BRCA testing is a genetic test that looks for mutations in the BRCA1 and BRCA2 genes.
    • These genes normally help repair DNA, but when they are mutated, they increase a person’s risk of developing certain cancers, particularly breast and ovarian cancers.
    • BRCA testing identifies whether a person has inherited these mutations, which can lead to Hereditary Breast and Ovarian Cancer (HBOC) and other cancers.
    • The test is done using a blood or saliva sample, which is collected and sent to a laboratory for analysis.
    • In the lab, next-generation DNA sequencing or other genetic analysis methods are used to examine the BRCA1 and BRCA2 genes for harmful mutations.
    • The test results can show whether a person has inherited a harmful mutation in these genes.
      • If the result is positive, it means they are at a higher risk for developing certain cancers.

    Issues with BRCA Testing

    • BRCA testing in India is expensive, costing between ₹15,000 to ₹30,000, which makes it unaffordable for many, particularly in lower-income populations.
    • Testing is often only offered to individuals with a family history of cancer, which misses about 50% of people who may have the mutations but no known family history.

    Significance for India

    • Breast cancer is the most common cancer among women in India, accounting for 27% of all cancer cases.
    • Women with BRCA mutations have up to a 72% risk of developing breast cancer.
      • Early identification allows for preventive measures, such as regular screenings or surgeries, which can reduce cancer incidence by up to 100%.
    • By increasing access to population-wide BRCA testing, India can improve early detection and reduce the burden of cancer on its healthcare system.
      • Early identification can also lower treatment costs and improve outcomes.

    PYQ:

    [2019] ‘RNA interference (RNAi)’ technology has gained popularity in the last few years. Why?

    1. It is used in developing gene silencing therapies.
    2. It can be used in developing therapies for the treatment of cancer.
    3. It can be used to develop hormone replacement therapies.
    4. It can be used to produce crop plants that are resistant to viral pathogens.

    Select the correct answer using the codes given below:

    (a) 1, 2 and 4

    (b) 2 and 3

    (c) 1 and 3

    (d) 1 and 4 only

  • New science awards, old political project 

    Why in the News?

    In 2023, the government replaced numerous opaque science awards with the Rashtriya Vigyan Puraskar (RVP), a streamlined set with clear criteria. It aimed to address concerns about transparency by involving committees led by respected scientists.

    Introduction of Rashtriya Vigyan Puraskar (RVP):

    • In 2023, the government replaced multiple science-related awards with the RVP, a consolidated and streamlined set of awards.
    • RVP introduced specific categories and clear eligibility criteria to enhance transparency and reduce opacity in the selection process.
    • Committees led by reputed scientists were tasked with finalizing the awardees, a measure intended to address concerns about bureaucratic interference.

    Concerns Over Selection Process:

    • Chance of political interference: The modification of rules overnight and the omission of some scientists from the final list, despite being shortlisted by the RVP committee, created suspicion of political interference.
    • Omission of the critic of Govt policy: Notably, some of the omitted scientists had previously criticized government policies, leading to concerns that the awards process might be used to marginalize dissenting voices within the scientific community.

    Shift in Authority:

    • Original Process: Initially, the RVP committee head had the authority to finalize the awardees.
    • Recent Change: A last-minute rule modification allowed the committee head to only “recommend” the final list to the Science Ministry, increasing the possibility of government intervention in the selection process.
    • Recognition Framework: The RVP awards are categorized into four main types: Vigyan Ratna for lifetime achievements, Vigyan Shri for distinguished contributions, Vigyan Yuva for young scientists, and Vigyan Team for collaborative efforts.

    Impact on the Scientific Community

    • Concerns Over Transparency: The modification of selection criteria just before the announcement of awardees has led to suspicions that political motives might influence who receives recognition.
      • Notably, some scientists who were initially included in the recommended list were omitted from the final public announcement, prompting questions about whether political pressures were involved.
    • Exclusion of Dissenting Voices: Many excluded scientists had previously expressed dissent against government policies. This trend suggests a troubling pattern where recognition is contingent upon alignment with governmental perspectives, potentially stifling academic freedom and critical discourse within the scientific community.

    Way forward: 

    • Strengthen Transparency and Autonomy: Establish an independent, non-governmental oversight body to ensure that the selection process remains transparent and free from political interference.
    • Safeguard Academic Freedom: Implement safeguards to prevent exclusion based on political or ideological views, ensuring that recognition is purely merit-based.

  • Neutrino Fog

    Why in the News?

    The LUX-ZEPLIN (LZ) experiment revealed that as we continue to push the boundaries of dark matter detection, the issue of neutrino fog becomes increasingly significant.

    What is the LUX-ZEPLIN (LZ) Experiment?

    • The LUX-ZEPLIN (LZ) experiment is a cutting-edge dark matter detection project located deep underground at the Sanford Underground Research Facility in South Dakota, USA.
    • It is one of the most sensitive experiments in the world designed to detect dark matter particles, which are believed to make up about 85% of the matter in the universe but have not yet been directly observed.
    • The heart of the LZ experiment is a tank filled with 10 tonnes of liquid xenon, a very dense and pure material.
    • The idea is that if a dark matter particle collides with a xenon atom, it will produce a tiny burst of light and free electrons.
    • These interactions are then detected by sensitive equipment surrounding the xenon.
    • The experiment is located 1.5 km below the Earth’s surface.

    What is Neutrino Fog?

    • Neutrinos, often referred to as “ghost particles,” are subatomic particles with nearly zero mass and no electric charge. 
    • “Neutrino Fog” refers to the interference caused by neutrinos—subatomic particles that rarely interact with matter—in dark matter detection experiments.
    • Neutrinos are produced naturally in the Sun’s core, supernovae, and even Earth’s atmosphere.
    • Though they pass through most matter undetected, their weak interactions can cause small disturbances in highly sensitive detectors.
    • As dark matter detectors become larger and more sensitive, they are more likely to detect neutrinos, leading to a “fog” of signals that can obscure or mimic potential dark matter interactions.

    PYQ:

    [2015] In the context of modern scientific research, consider the following statements about ‘IceCube’, a particle detector located at South Pole, which was recently in the news:

    1. It is the world’s largest neutrino detector, encompassing a cubic kilometre of ice.

    2. It is a powerful telescope to search for dark matter

    3. It is buried deep in the ice.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3 only

  • Hepatitis E Virus (HEV)

    Why in the News?

    Recent research indicates that pigs may act as a transmission vehicle for a strain of the hepatitis E virus (HEV) commonly found in rats, known as Rocahepevirus ratti, or rat HEV.

    Role of Pigs in Transmission

    • HEV Reservoir: Pigs naturally carry hepatitis E virus (HEV), particularly strains that can infect humans.
    • Transmission via Pork: Humans can contract HEV by consuming raw or undercooked pork from infected pigs.
    • Environmental Contamination: Infected pigs shed HEV in faeces, contaminating the environment and water sources, potentially spreading the virus to humans.
      • Poor sanitation in pig farms facilitates HEV transmission between pigs and increases the risk of human infection through the food chain.
    • Cross-Species Transmission: Pigs may also act as intermediaries for rat HEV, transmitting the virus from rats to humans in farm environments.

    About Hepatitis E Virus (HEV):

    • Hepatitis E is caused by the Hepatitis E Virus (HEV), which is a positive-sense, single-stranded, non-enveloped RNA virus.
    • HEV is classified under the family Hepeviridae, genus Orthohepevirus.
    • It was first identified during an outbreak among Soviet soldiers in Afghanistan in 1983.
    • The earliest well-documented HEV epidemic occurred in New Delhi, India, in 1955, retrospectively identified as HEV.
    • Transmission:
      • The primary route of transmission is fecal-oral, especially through contaminated water and food.
      • Zoonotic transmission is possible with genotypes 3 and 4, commonly spread through undercooked meat or direct animal contact.
    • Symptoms:
      • Jaundice, nausea, fatigue, and elevated liver enzymes.
      • Severe cases can lead to liver failure, especially in pregnant women and immunocompromised individuals.
    • Prevention and Cure:
      • A vaccine, HEV 239, is approved for use in China, but no vaccine is widely available or approved in most countries, including the United States.
      • There is no specific antiviral treatment for acute HEV.
      • Prevention relies on improved sanitation, safe drinking water, and proper food handling.

    PYQ:

    [2019] Which one of the following statements is not correct?

    (a) Hepatitis B virus is transmitted much like HIV.

    (b) Hepatitis B, unlike Hepatitis C, does not have a vaccine.

    (c) Globally, the number of people infected with Hepatitis B and C viruses are several times more than those infected with HIV.

    (d) Some of those infected with Hepatitis B and C viruses do not show the symptoms for many years.

  • Param Rudra Supercomputer

    Why in the News?

    PM has dedicated three “PARAM Rudra” Supercomputers along with High-Performance Computing (HPC) systems, ‘Arka’ and ‘Arunika’, to the nation.

    What are High-Performance Computing (HPC) Systems?

    • HPC systems are powerful computational systems that perform large-scale and complex computations at incredibly high speeds.
    • HPC Arka system at IITM has 11.77 Peta Flop capacity and will, for the first time, help improve the country’s horizontal resolution of its global weather prediction models to 6 km from the existing 12 km.
    • HPC Arunika comes with 8.24 Peta Flop capacity. This HPC will prove beneficial in upgrading weather forecast resolution at block levels.

    What is PARAM Rudra?

    • PARAM Rudra is a high-performance computing (HPC) system and part of India’s PARAM series of supercomputers.
    • It is developed indigenously by the Centre for Development of Advanced Computing (C-DAC) under the National Supercomputing Mission (NSM).

    Applications of PARAM Rudra

    • Astronomy: Used by the Giant Metre Radio Telescope (GMRT) in Pune to study Fast Radio Bursts (FRBs) and other astronomical phenomena.
    • Atomic Physics and Material Science: The Inter-University Accelerator Centre (IUAC) in Delhi uses PARAM Rudra for research in these areas.
    • Physics, Cosmology, and Earth Sciences: The supercomputer at the SN Bose National Centre for Basic Sciences in Kolkata supports advanced studies in these domains.
    • Weather Forecasting and Agriculture: The supercomputers enhance weather forecasting, benefiting industries like agriculture, where improved predictions help farmers make informed decisions.

    Back2Basics: National Supercomputing Mission (NSM):

    Details
    Launch Year 2015
    Objective
    • To enhance India’s research capacities by creating a Supercomputing grid supported by the National Knowledge Network (NKN)
    • To position India as a global leader in supercomputing technology by boosting research, development, and innovation
    Nodal Agency Department of Science and Technology (DST);

    Ministry of Electronics and Information Technology (MeitY)
    Implementation Agencies C-DAC, Pune  and IISc, Bengaluru
    Phases 1. Phase I: Assembling supercomputers
    2. Phase II: Manufacturing components in India
    3. Phase III: Designing an indigenous supercomputer
    Historical Context India’s supercomputer program began after the USA’s technology embargo in the late 1980s, leading to the creation of C-DAC and the unveiling of PARAM 800 in 1991 (second-fastest globally at the time)
    Notable Supercomputers AI Supercomputer’ AIRAWAT’ and PARAM Siddhi – AI are currently the fastest supercomputers in India.

    AIRAWAT has been ranked 75th in the world as of June 2023.
    Global Context Frontier (USA) is the world’s fastest supercomputer since December 2023.

  • What are retractions and why do they matter?

    Why in the News?

    The ‘Retraction Watch’ database reports an Indian scientist in Lucknow with 45 retractions, while a Kolkata researcher, who published 300 papers in a year, had six papers retracted.

    What is retraction?

    • A retraction is when a scientific journal officially takes back a research paper because it contains serious mistakes or was found to be dishonest (like using fake data).
    • It’s like saying, “This paper shouldn’t be trusted,” to make sure other scientists don’t rely on wrong information.

    What is retraction index?

    • The retraction index is a way to measure how often papers are retracted in a particular journal.
    • It helps to see the rate of retractions compared to the total number of papers published by the journal.

    How It’s Calculated:

    • It is calculated by multiplying the number of retractions by 1,000 and dividing it by the total number of papers published in that journal during a specific time period.

    What are the primary reasons for retraction?

    • Plagiarism: Copying or presenting someone else’s work without proper attribution.
    • Fabrication/Falsification: Deliberate manipulation of data, experiments, or results to present false findings.
    • Image Manipulation: Altering figures or graphical representations, especially in fields like biology and medicine.
    • Paper Mills: Fake or low-quality papers produced by organizations and sold to researchers to inflate publication counts.
    • Ethical Violations: Including authorship disputes, undisclosed conflicts of interest, and failure to obtain proper consent for studies.
    • Errors in Data: Honest mistakes in data collection, interpretation, or analysis that render the findings invalid.

    How do retractions affect the credibility of scientific research?

    • Erosion of Trust: Scientific integrity relies on trust; retracted papers can cause scientists to lose confidence in published research.
    • Hindrance to Scientific Progress: Retractions delay progress, as future research may be based on faulty or retracted studies.
    • Impact on the Reputation of Researchers and Institutions: Scientists and institutions involved in retractions often face damage to their credibility and career prospects.
    • High-Impact Journals at Greater Risk: More retractions occur in high-impact journals, suggesting a vulnerability due to the pressure to publish groundbreaking work quickly.
    • Harm to Public Perception: High-profile retractions, especially in fields like medicine, can damage public trust in science and scientific institutions.

    What is the process of retracting a paper?

    • Detection: Retractions are often initiated when errors or misconduct are identified through peer reviews, investigations, or by other researchers who question the validity of the work.
    • Investigation: The journal and, in some cases, the author’s institution will conduct an inquiry to determine whether the issues warrant retraction.
    • Notification: Once a decision is made, the journal issues a notice of retraction. This document typically explains why the paper is being retracted (e.g., misconduct or error).
    • Publication of Retraction Notice: The retraction notice is published in the journal, often linked to the original paper. The original article is marked as retracted but remains in the journal archives for transparency.
    • Database Update: Retractions are indexed in databases like PubMed, Retraction Watch, and others, so researchers are informed of flawed studies.

    Way forward: 

    • Strengthen Peer Review and Use AI Tools: Implement advanced AI tools to detect plagiarism, data manipulation, and image alteration during the peer review process to prevent flawed papers from being published.
    • Shift Focus from Quantity to Quality: Encourage institutions to prioritize the quality of research over the sheer number of publications to reduce the pressure on researchers and discourage reliance on paper mills.

  • Findings based on China’s Chang’e-5 Mission

    Why in the News?

    • Scientists long believed that volcanic activity on the moon ceased about a billion years ago.
      • However, a study based on China’s Chang’e-5 mission samples has questioned this belief with evidence suggesting the moon had active volcanoes as recently as 120 million years ago.

    Chang’e-5 Mission: Overview and Recent Findings

    • Chang’e-5 is a mission launched in November 2020 as part of the Chang’e lunar exploration program.
    • It was designed to:
      • Collect samples from the moon’s surface and bring them back to Earth for analysis.
      • Study the geology and mineral composition of the moon.
    • It successfully landed on the “Mons Rumker region”, a volcanic complex in the Oceanus Procellarum (the ‘Ocean of Storms’) area on the moon’s near side, and returned about 1.7 kg of lunar material to Earth in December 2020.

    Recent Findings Based on Chang’e-5 Mission

    • Recent studies of samples have revealed evidence of volcanic activity on the moon as recently as 116-135 million years ago.
      • It challenges the previous belief that the moon’s volcanic activity ceased about a billion years ago.
    • The analysis of lunar glass beads collected by Chang’e-5 has provided insights into both volcanic eruptions and asteroid impacts that shaped the moon’s surface.

    What are the Beads on the Moon?

    • Lunar glass beads are small, spherical or egg-shaped glass particles found on the moon’s surface.
    • These beads are formed in two main ways:
      • Volcanic Activity: During volcanic eruptions, molten lava fragments are thrown into the air, where they cool rapidly and form glass beads.
      • Impact Events: When asteroids or meteorites hit the moon’s surface, the intense pressure and heat melt the surface material. The molten material cools quickly, forming glass beads as it lands back on the surface.
    • These beads are important because they:
      • Provide clues about the moon’s geological history.
      • Help scientists determine the age of volcanic eruptions.
      • Offer insights into the formation of the moon’s surface and its volcanic and impact events.

    Key characteristics of Lunar Glass Beads

    • Composition: These beads are primarily made of silicon, magnesium, and iron, with trace amounts of other elements such as potassium, titanium, and uranium.
    • Volcanic vs. Impact Beads: Volcanic glass beads tend to be more uniform, while impact beads may show fractures or deformations caused by high-energy impacts. Volcanic beads often contain more volatile elements like sulphur, which are released during eruptions.

    PYQ:

    [2012] What do you understand by the term Aitken basin?

    (a) It is a desert in the southern Chile which is known to be the only location on earth where no rainfall takes place.

    (b) It is an impact crater on the far side of the Moon.

    (c) It is a Pacific coast basin, which is known to house large amounts of oil and gas.

    (d) It is a deep hyper saline anoxic basin where no aquatic animals are found.