What are soil layers called?

• Rock

• Horizons

• Layers

• Profile

What is the origin of clay, silt, and sand?

• humus

• bedrock

• subsoil

• topsoil

What is permeability?

• how freely water passes through soil

• how much acid is in soil

• the size of the soil particles

• the composition of soil

Which layer is the parent material?

• Horizon O

• Horizon A

• Horizon B

• Horizon C

• Horizon R

Which layer is the subsoil?

• Horizon O

• Horizon A

• Horizon B

• Horizon C

• Horizon R

Soil is made of

• weathered rocks and minerals
• dead plants and animals
• air and water
• all of the above

The layer of soil which the topsoil is found.

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R

What is a soil problem all farmers face?

• soil hardening
• soil erosion
• soil spoiling
• soil pollution

According to the settling tube experiment, which soil is the heaviest and fell to the bottom of the tube?

• clay
• humus
• sand
• silt

Which soil horizon is contains decomposed plants and animals?

• A Horizon

• B Horizon

• C Horizon

• O Horizon