Soil

Which layer is the subsoil?

• Horizon O

• Horizon A

• Horizon B

• Horizon C

• Horizon R

Which layer of soil is on the bottom of a soil profile?

• topsoil

• subsoil

• bedrock

• humus

When plants, animals, and other organisms die, they break down and become part of the soil. What is this part of the soil called?

• sand

• silt

• clay

• humus

Tags

NGSS.MS-LS2-3

Why is topsoil darker than all other levels of soil?

• It contains all the darker colored minerals.

• It contains volcanic rock.

• It contains more organic matter.

• It contains bits of burned trees.

What are the four soil components?

• Sand, rock, humus, air

• Rock, humus, air, water

• Rock, humus, roots, water

• Rock, humus, animals, plants

The horizon contains partly weathered rock

• C Horizon

• A Horizon

• B Horizon

• Bedrock

The horizon is called the subsoil, usually consist of clay and other particles leached down from the A Horizon

• B Horizon

• A Horizon

• Erosion

• Bedrock

Soil formation begins with the weathering of

• litter

• humus

• bedrock

• the A horizon

Which horizon is also called "topsoil"?

• Horizon O

• Horizon A

• Horizon B

• Horizon C

This layer is also called "bedrock".

• Horizon A

• Horizon B

• Horizon C

• Horizon R

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-3