Soil Formation and Composition

Front

The breaking down of rocks is called ______________.

Back

Weathering

Front

Which are contained in soil?

Back

Small rock fragments and air

Front

What is soil composed of?

Back

All of the above (weathered rock, minerals, living things)

Front

Decayed organic material turns into dark colored material called __.

Back

Humus

Front

A mixture of pieces of rock, decomposing plants and animals is called _____________.

Back

Soil

Front

What is the top layer of soil called?

Back

Topsoil

Front

What is the process by which plants and animals break down organic matter?

Back

Decomposition

Front

What are the three main types of soil?

Back

Sand, silt, and clay

Front

What is the role of earthworms in soil?

Back

They aerate the soil and help in decomposition.

Front

What is humus?

Back

Dark, organic material formed from decayed plants and animals.