Question

Question 1 (c)
Fill the missing word in the blank spaces in the following statements:
(c) Near the earth’s surface $\underset{–}{}$ air rises up whereas $\underset{–}{}$ air comes down.

Answer 1

(c) Near the earth's surface $\underset{–}{warm}$ air rises up whereas $\underset{–}{cold}$ air comes down.

The reason for this is that the warm air is lighter than cold air.