Q. Consider the following definitions of the major domains of Earth:

1. The solid portion of the earth: Biosphere
2. The gaseous layers that surround the earth: Atmosphere
3. Area of earth covered by water in all its forms: Hydrosphere
4. Narrow zone between land, water and air together: Lithosphere

Which of the above is / are correct?
Answer: Only 2 and 3
Notes: The solid portion of the earth on which people live is called the Lithosphere. The gaseous layers that surround the earth, is the Atmosphere, where oxygen, nitrogen, carbondioxide and other gases are found. Water covers a very big area of the earth's surface and this area is called the Hydrosphere. The Hydrosphere comprises water in all its forms, that is, ice, water and water vapour. The Biosphere is the narrow zone where we find land, water and air together, which contains all forms of life.

This question is part of UPSC Daily 20 MCQ Series Course on GKToday Android app.