Earth's changing surface (lithosphere)

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Contour plowing means plowing

The decayed plant and animal material in soil is called

Weathering by abrasion is usually caused by

A point shose latitiude is 0 degrees is located on the

The main reason farmers use crop rotation is to slow down the process of

Chemical weathering is most rapid in areas that are

The rich topsoil known as humus found in soils comes from

Two acids found in acid precipitation are