Question

Pragnesh's mother wants to use rain water to recharge the ground water by digging a pit.
Which of the following should she line the bottom of the pit with?

A. Gravel layer
B. Metal layer
C. Plastic layer
D. Concrete layer

Answer 1

Gravel layer, as it will need the nutrients.

Answer 2

we should leave gravel layer at the bottom of the pit because there are earthworms which helps us lot.