Soil

What is HUMUS made from?

• Chick-Peas
• The remains of decayed plants and animals
• Beans
• Cheese

Are there minerals in soil?

• Yes

• No

What are the three types of soil?

• insects, sand, topsoil
• clay, sand, humus
• topsoil, subsoil, bedrock
• earthworms, sand, silt

When plants, animals, and other organisms die, they break down and become part of the soil. What is this part of the soil called?

• sand
• silt
• clay
• humus

Which layer is the bottom of the soil profile?

• C - Partially Weathered Parent Material
• D - Separated rock
• R - Bedrock
• A - Topsoil

Many plants cannot grow in sandy soil. Why is this true?

• Sandy soil does not hold enough water.
• Oxygen cannot pass through sandy soil.
• Roots cannot easily push through clay soil.
• Sandy soil has too many nutrients.

Soil is made of

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

Which layer of soil are these roots growing in?

• subsoil
• topsoil

Humus is important because...

• It contains toxic waste
• It contains acids and bases
• It breaks down rocks
• It helps plants grow

What soil is best for growing plants?

• clay

• sand

• mud

• topsoil