Available Answers

1. 1.

   What is the chemical nature of oxygen?

2. 2.

   Name any three gases present in extremely low percentages in the environment.

3. 3.

   What are the phenomena caused by the dust particles?

4. 4.

   What is the average height of the troposphere?

5. 5.

   What are CFCs?

6. 6.

   What is the coldest layer of the atmosphere?