Soil, Weathering, Erosion, and Deposition Test

Which of these is NOT one of the four ingredients of soil?

• air

• earthworms

• minerals

• organic matter

• water

Soil formation is happening very slowly all the time.

• True

• False

Which color of soil shows that there is a high iron content?

• black/dark brown

• yellow

• reddish-brown/orange

• grey

Which color shows that the soil has a lot of humus and is very fertile?

• black/dark brown

• yellow

• reddish-brown/orange

• grey

Organic matter refers to any material that used to be _______.

• really hot

• a mineral

• alive

• air

The bigger the particles of soil, the more water it will retain.

• True

• False

Which type of soil has the smallest particles?

• loam

• sand

• silt

• clay

Which type of soil is actually a mixture of the other three types?

• loam

• sand

• silt

• clay

If you mix a sample of soil with water in a jar and then let it settle, which ingredient in the soil is the only one that will float?

• gravel

• humus

• sand

• silt

Which layer of soil contains the most organic matter and is the most loosely packed?

• topsoil

• subsoil

• bedrock

• loam