Soil Test Practice

How many soil horizons do you see in the picture?

• 1

• 2

• 3

• 4

Which soil horizon is in the middle? It is also known as the subsoil?

• A

• B

• C

• O

An earthworm, insect larvae, and ants would NOT be found in

• A

• C

• O

Which is NOT a factor that determines runoff?

• freezing and thawing

• vegetation

• type of soil

• amount of rain

The loose, weathered material on Earth's surface in which plants can grow

• soil

• bedrock

• humus

• loam

Which horizon forms first?

• A

• B

• C

• S

What force creates runoff?

• gravity

• waves

• loam

• litter

Which is NOT a weathered rock particle found in sand?

• clay

• subsoil

• silt

• sand

Living organism supply ___________ to the soil.

• bedrock

• humus

• clay

• silt

The loose layer of plant leaves and stems on the ground is

• humus

• loam

• litter

• silt