Why should we conserve soil?

Choose the right word and fill in the blank:

Tiny pieces of rocks form _____. (water/soil) 

Choose the correct option from the following and fill in the blank:
(Sand, Clay, Pebbles)

_____ break down into the soil.

Choose the right word and fill in the blank provided below.

When we throw garbage carelessly it leads to _____ (land/air) pollution.

Choose the correct word from the box and fill in the blank:

(subsoil, gravel, rocks, loam, crops)

Soil is formed by the breaking down of _____ into smaller pieces.