Fill up the blanks in the following: 

(a) The process of changing of water into its vapour is called [[1]]. 

(b) The process of changing water vapour into water is called [[2]]. 

(c) No rainfall for a year or more may lead to [[3]] in that region. 

(d) Excessive rains may cause [[4]].

Fill up the blanks in the following: 

(a)    The process of changing of water into its vapour is called Evaporation.

Evaporation is a process where water changes into vapour due to gain of heat. 

(b)   The process of changing water vapour into water is called Condensation. 

Condensation is a process where vapour changes into water due to loss of heat.

(c)    No rainfall for a year or more may lead to drought in that region. 

Long periods of time without rainfall causes droughts in an area.

(d)   Excessive rains may cause flood.

Too much rainfall may causes flood in an area.