Soil Review

Soil is made of

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

What do we call the layers of soil?

• Deposits
• Horizons
• Minerals
• Rocks

The very top layer of soil is mostly made of

• Solid rock 
• Clay and mineral deposits
• A mixture of minerals and organic material
• Mostly organic material (humus)

Which soil horizon is on the bottom?

• topsoil

• subsoil

• bedrock

• bottomsoil

Which of the following is NOT one of the three layers of soil?

• topsoil
• undersoil
• subsoil
• bedrock

What is the layer of soil just below the topsoil?

• soil
• subsoil
• topsoil
• terrace farming

Decayed organic material in soil is called______.

• Litter
• Silt
• Humus
• Clay

The MAIN  thing Decomposers do for the soil is the following:

• Store moisture
• Burrow deep in the soil
• Make space for air and water
• Break down and digest dead organisms

Look at the following data table and label each soil horizon using the descriptions. 

• Beaker 1 = Bedrock   Beaker 2 = Horizon B (subsoil)   Beaker 3 = Horizon A (topsoil)   Beaker 4 = Horizon C (parent material)
• Beaker 1 = Bedrock   Beaker 2 = Horizon C (parent material)   Beaker 3 = Horizon B (subsoil)   Beaker 4 = Horizon A (topsoil)
• Beaker 1 = Horizon C (parent material) Beaker 2 = Horizon B (subsoil)   Beaker 3 = Horizon A (topsoil)   Beaker 4 = Bedrock
• Beaker 1 = Bedrock Beaker 2 = Horizon A (topsoil)   Beaker 3 = Horizon B (subsoil)   Beaker 4 = Horizon C (parent material)

Which layer of the soil profile contains a solid layer of rock?

• 1
• 2
• 3
• 4