Science (SOIL FORMATION)

Which of the following locations would have the slowest rate of weathering?

North Pole

Which soil horizon is located closest to the earth's crust?

O horizon

Review

Soil is made of weathered rock, organic material, air, and water. Soil is classified by chemical and physical properties, such as texture and color. A soil profile shows the arrangement of horizons. Most soils have four main horizons—the organic horizon (O), the surface horizon (A), the subsoil (B), and the substratum (C). Temperature and moisture are the most important climactic factors in soil formation. Fertile soil usually occurs in areas with moderate to low incline. The higher the number of living organisms in an area, the greater will be the rate of weathering and soil formation. Fertile soil develops from parent material high in essential elements (Ca, Mg, K, and Na).

How are the O and A horizons similar?

They both contain organic material.

Choose all the answers that apply. Soil is made of _____.

air water organic material minerals weathered rock

soil profile

arrangement of horizons in a soil sample

topography

elevation and slope of land

Acidic soil is caused by _____.

hydrogen ions (H+)

horizon

layer of distinct soil

Rocks formed at high temperatures and pressures are ________________ weathered than rocks formed at low temperatures and pressures.

more easily

Which of the following locations would have the poorest quality soil?

mountain top

Which of the following would have the greatest influence on soil formation?

rainfall

soil

top layer of mineral and organic material on Earth's surface

Cycling nutrients between living organisms and the ground determines soil fertility.

true