Soil

What is HUMUS made from?

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

What are the three components of soil?

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

Are there minerals in soil?

• Yes

• No

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

Soil is made of

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

Humus is important because...

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

Which of the following processes will most likely contribute to the development of soil?

• Volcanic eruptions that make new land

• Building up of snow in very cold areas

• Migration of animals to warmer climates

• Breaking down of rock by wind, water, and ice

Soil is composed of all of these natural materials EXCEPT

• weathered rock

• plant matter

• plastic substances

• animal remains

The weathering of rocks into small pieces forms what natural resource?

• Minerals

• Water

• Coal

• Soil

How do plants contribute to the formation of soil? Plants

• cover the soil and shade it from sunlight.

• die, decompose and become part of the soil.

• use soil to grow and develop over time.

• support the animal life in the soil.