Soil

Front

What is soil formation primarily initiated by?

Back

The weathering of bedrock.

Front

Which layer of soil is known as the top layer where most plant roots grow?

Back

Topsoil.

Front

What percentage of soil is made up of minerals?

Back

45%.

Front

In which soil horizon are deep plant roots typically found?

Back

Horizon B.

Front

What is the first true layer of soil called?

Back

Horizon A.

Front

What is the organic component of soil that is formed from decomposed plants and animals?

Back

Humus.

Front

What is the layer of soil that is rich in nutrients and supports plant growth?

Back

Topsoil.

Front

What is the process called when rocks break down into smaller particles?

Back

Weathering.

Front

What is the term for the layer of soil that contains mostly clay and minerals?

Back

Subsoil.

Front

What is the top layer of soil that consists of organic matter, such as decomposed leaves?

Back

Horizon O.