Soil: Its Components, Formation, and Types

What are the four soil components?

• Sand, rock, humus, air
• Rock, humus, air, water
• Rock, humus, roots, water
• Rock, humus, animals, plants

Which factors are primarily responsible for decomposition of organic materials in soil?

• Animal action and plant action
• Animal action and fungus action
• Fungus action and microorganisms
• Microorganisms and animal action

What contributes sediment to soil formation?

• Parent rock
• Father rock
• Mother rock
• Large rocks

Does the vertical cross-section of soil in the picture show a soil profile or a soil horizon?

• Soil Profile
• Soil Horizon

Do the horizontal cross sections in the picture show soil profiles or soil horizons?

• Soil Profiles
• Soil Horizons

What is the movement of soil from one place to another?

• weathering
• deposition
• discharge
• erosion

Soil formation begins with the weathering of_______.

• Humus
• Subsoil
• Litter
• Rock

Humus is.....

• the dead parts of plants and animals in soil.
• A food we eat with pretzels.
• The tiny particles inside of soil
• The roots that come off of a plant and live in soil.

Decayed organic material turns into dark colored material called __.

• litter
• clay
• humus
• soil

Weathering occurs fastest in

• cold, dry climates
• cold, wet climates
• hot, dry climates
• hot, wet climates