"How Soil forms" Section Review

What are the smallest soil particles?

• sand

• silt

• clay

• shale

What is the material that makes soil fertile?

• sand

• humus

• clay

• sod

 This is what the weathered rock and other materials in the cracks of rock have started to become

• grass

• sod

• humus

• soil

True or False:

The smallest soil particles are sand

• True

• False

True or False:

In cold, dry climates the soil is often very thick

• True

• False

In which soil horizon is there bedrock?

• Horizon A

• Horizon B

• Horizon C

• Horizon D

In which soil horizon is there topsoil?

• Horizon A

• Horizon B

• Horizon C

• Horizon D

In which soil horizon is there subsoil?

• Horizon A

• Horizon B

• Horizon C

• Horizon D

What does most of the mixing of humus with other material in soil as they eat their way through the soil?

• The cookie monster

• bacteria

• earthworms

• fungi

When plants shed leaves or die and their remains fall to the ground they become part of a loose layer called what?

• clutter

• trash

• waste

• litter