Question

(b)Choose the correct answer
Drinking water sources can be contaminated by
a. natural materials b. run-off from fields an
What percentage of Earth's water supply is fresh w
a. 3%
b.5%
We can get the purest form of water:
a. by boiling water b. from tube wells
Heavy mechanical complexes use a large amount
a. cooling
b. freezing
Which one is not the source of water pollution?
a. Human wastes b. industrial wastes
​

Answer 1

Answer:

(b)

a) natural materials

a) 3%

b) from tube wells

a) cooling

both a and b