Soil

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 layer of soil 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

What is soil?

• A mixture of minerals
• A mixture of water, minerals, gases and organic matter
• A type of rock
• A type of bacteria

What does weathering mean?

• To form or create new
• To build up
• To break down
• To completely destroy

What effect did over plowing and cutting down trees in the Great Plains during the 1930’s?

• It had little effect
• It increased soil fertility
• It was a primary cause of the Dust Bowl
• Farmers had a great harvest

Soil is made of

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