Sand is made of different types of rocks. The shapes and sizes are not all the same. Sand is a ?

A soil

Explanation:

Sand is a granular material composed of finely divided rock and mineral particles. It is defined by size, being finer than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass.

b. a lightning bug, plug of grass, and a worm