SOIL

What happens when soil becomes nutrient depleted?

Soils with approximately equal parts of sand, clay, and silt are called-

Repeated freezing and thawing is an example of which type of weathering?

Layers of soil are called-

Decaying and decomposing organic material is known as-

What two things affect the rate of weathering?

In  soil the A layer forms when clay and minerals wash into the B layer. The A layer is called-

In a soil profile, what lies below and can be part of  the C horizon?

The decayed organic material in soil is called-

Soil is never eroded into the seas and oceans.

The main component of soil is-

Topsoil is important for agriculture because-

No-till farming, a type of conservation farming-

Soil is a mixture of all EXCEPT the following-

The grinding away of rock particles by wind and water is called-

What are four of the soil horizons?

Organic matter can best be described as-

When parent rock breaks down it becomes-

What is soil?

The Dust Bowl happened because of-

Which of the following is the most important growing layer of the soil horizons?

Soil erosion is harmful because-

Which area would contain soil with the highest organic matter content?

Soil is formed only through parent rock.

Fertile soil is a valuable resource because-

The minerals that are present in the soil of an area depend on the-

A mixture of rock, pieces of minerals, organic matter, bacteria, and water is called-

Mechanical weathering changes the mineral make up of the rock.

An example of chemical weathering is

Weathering is-

Overgrazing can increase soil erosion because-

Which soil layer is the richest in organic material (humus)?

Organisms aid the decomposition process by adding this to the soil-

What process transports minerals from a soil's A horizon to the B horizon?

Which process is primarily responsible for the formation of soil?

Bacteria play an important role in soil formation because they-

Acid dissolving minerals in rocks causing them to change is which type of weathering? 

Farmers can reduce soil erosion by constantly plowing their fields.

Only two types of soil exist in the United States.

How do earthworms enrich the soil?

Erosion is-

Which layer includes  partially broken down bedrock?