Mentor’s comment-

• In the introduction briefly explain the significance of landforms formed by the action of water.
• In the body explain in detail what actions the groundwater performs. Define groundwater. Explain the features like; Sinkholes and caves are erosional landforms formed due to the action of
  ground water. Then move onto explain depositional landforms of groundwater. Discuss with diagrams the karst landforms associated with groundwater.
• Conclude with significance of such action of ground water in creation of landforms.