Q. With reference to sinkholes, consider the following statements;
1.Sinkholes are depressions formed in the ground when layers of the Earth’s surface start collapsing into caverns.
2.Sinkholes are formed only due to natural process.
Which of the statements given above is/are correct? 
Answer: A
Notes:
Statement 1 is correct: Sinkholes are depressions formed in the ground when layers of the Earth’s surface start collapsing into caverns.
Statement 2 is incorrect: Sinkholes can be formed due to natural processes or human activity.
Natural process: Typically, sinkholes form in areas of “karst” terrains, where the rock below the surface of the Earth can be easily dissolved by groundwater.
Human activities: This can happen due to broken land drains, water mains and sewerage pipes, and diversion of surface water, among other reasons.
Source: Indian Express
