Weathering and Soil Test Review

Front

What is mechanical weathering by plant roots?

Back

The process of roots growing into cracks in rocks and breaking them apart.

Front

Which horizon contains the subsoil?

Back

B horizon.

Front

True or False: Weathering by carbon dioxide involves groundwater containing weak acids created by rainwater mixing with carbon dioxide.

Back

True.

Front

Which horizon contains the most humus?

Back

A horizon.

Front

In what type of climate does rock weather fastest?

Back

Warm and wet climates.

Front

What is weathering?

Back

The process of breaking down rocks into smaller pieces by physical or chemical means.

Front

What is soil made of?

Back

Soil is made of minerals, organic matter, water, and air.

Front

What is the O horizon?

Back

The top layer of soil, rich in organic material and humus.

Front

What is the role of carbonic acid in weathering?

Back

Carbonic acid, formed from CO2 and water, helps dissolve minerals in rocks.

Front

What is the difference between mechanical and chemical weathering?

Back

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