Soil Conservation

When discussing soils, humus can best be described as __________________________

Plowing along elevation lines is known as _________________________

Which of the following is found in the greatest % in soil?

This horzion contains weathered rock pieces from the parent rock. 

Crops that are planted in rows parallel to land contours are called:

If present, this horizon contains humus

What was the number one cause of the Dust Bowl?

Rates of weathering depend on which 3 factors?

This horizon contains the parent material (usually bedrock).

The cross-section of soil is called the soil's ______________.

Physical abrasion changes the composition of the substance.  True OR False?

This horizon is known as the subsoil and holds nearly all of the minerals

The layers of soil are called _________________?

Which layer of a soil profile forms first from the bedrock?

Planting trees along edges of fields provides:

Wind Abrasion is an example of which type of weathering?

The most critical factor to protect our soils from wind/water erosion is:

Weathering rates are faster in _______________ climate.

Which definition fits EROSION?

Approximately how many years does one centimeter of topsoil take to form?