Soil/Weathering

Front

What is the soil horizon that is called the topsoil?

Back

A Horizon

Front

What are the four materials that make up soil?

Back

rock particles, humus, water, air

Front

What is a layer of soil with properties that differ from other layers?

Back

soil horizon

Front

What are two examples of chemical weathering?

Back

dissolving and rusting

Front

What is the term for the uppermost layer of soil that contains organic material?

Back

O Horizon

Front

What is humus?

Back

Decomposed organic matter in soil that enriches it.

Front

What is the process by which rocks break down into smaller pieces?

Back

Weathering

Front

What is the difference between physical and chemical weathering?

Back

Physical weathering breaks rocks into smaller pieces without changing their composition, while chemical weathering alters the minerals in the rocks.

Front

What is soil profile?

Back

A vertical section of soil that shows all its layers.

Front

What role do plant roots play in soil formation?

Back

They help break down rocks and contribute organic matter.