Processes that break down rock at Earth's surface.

_______ splits rock when water freezes and expands in existing cracks in rock.

Plants roots can expand in existing cracks and split rocks open.

_________ is the most important cause of chemical weathering.

Which of these is chemical weathering?

__________ is the loose, weathered material on Earth's surface.

________ is the decomposed organic material found in soil.

Peanuts and soybeans(legumes) enrich the soil because they contain ________ -fixing bacteria in their roots.

The extreme loss of topsoil due to drought in the 1930's is called

To put nutrients back into the soil, farmers alternate between 2 crops. This is called

Farmers can keep the old plant stalks on the field during the summer to keep the soil from blowing during the winter. This is called

Material moved by erosion is called

Mass movement is erosion caused by

Water that does not evaporate or sink into the ground is referred to as

A ________ is a stream or small river that flows into a larger river.

A meander is a _______ in the course of a river.

Karst topography is associated with the presence of ______

_________ is scraping or scratching.

_______ is glacial till deposited at the front and side edges of a glacier.

______ is fine, wind-deposited sediment.

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