Question

Normally, the temperature decreases with the increase in height from the Earth's surface, because

1. the atmosphere can be heated upwards only from the Earth's surface
2. there is more moisture in the upper atmosphere
3. the air is less dense in the upper atmosphere

Select the correct answer using the codes given below:
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Answer 1

1. the atmosphere can be heated upwards only from the Earth's surface 
(a) 1 only 

Answer 2

the ans is (a) 1 only.
1. the atmosphere can be heated upwards only from the Earth's surface