Soil Formation

Soil formation begins with the weathering of_______.

• Humus
• Subsoil
• Litter
• Rock

Earthworms, moles and other animals help soil formation by:

• Breaking rock down
• Mixing and loosening soil by burrowing 
• Draining the water from soil
• Eating soil

Tags

NGSS.MS-LS2-3

Soil is composed of all of these natural materials EXCEPT

• weathered rock
• plant matter
• plastic substances
• animal remains

In which of the following soil layers is humus mostly found?

• A horizon

• B horizon

• C horizon

• D horizon

Tags

NGSS.MS-LS2-3

What is another name for horizon A in a soil profile?

• litter
• subsoil
• bedrock
• topsoil

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-5

What is another name for horizon A in a soil profile?

• litter
• subsoil
• bedrock
• topsoil

The soil horizons are different from the other based on their

• Chemical and physical features.

• Physical features mainly colour and texture.

• Chemical features only.

Which of the factors involved in soil formation?

• Parent material

• Temperature

• Biota

• Climate

• Topography

The topmost horizon contains partially decomposed organic matter called (a)  

The thickness of the soil profile is affected by the (a)   taken for the soil to form.

Tags

NGSS.MS-ESS2-4