Available Answers

1. 1.

   What are the four spheres of the Earth?

2. 2.

   List the two most important atmospheric gases and their relative composition.

3. 3.

   What is 'Tropopause'?

4. 4.

   What is the approximate height of troposphere near the Equator?

5. 5.

   What is the extent of lonosphere?

6. 6.

   What does it mean by 'Ozone depletion'?