Question

question 20 of 25
what can people do to preserve earths water supply?
a. support thermal power plants
b. prevent water pollution
c. avoid drip - irrigation systems
d. build more private swimming pools

Explanation:

Preventing water pollution helps keep water clean and available for use, thus preserving Earth's water supply. Thermal power plants consume large amounts of water and may cause pollution, so supporting them is not helpful. Drip - irrigation systems are for efficient water use in agriculture, not directly for water - supply preservation in a general sense. Building more private swimming pools increases water consumption, which is not beneficial for water - supply preservation.

Answer:

B. Prevent water pollution