Grade 5

What is the top layer of soil called?

• Bedrock

• Subsoil

• Topsoil

• Sand

Which of these can help prevent soil erosion?

• Cutting down trees

• Planting grass and trees

• Pouring water on soil

• Removing all plants

What causes soil erosion?

• Wind and water

• The sun

• Earthworms

• Growing too many plants

Which layer of soil is the hardest?

• Bedrock

• Topsoil

• Subsoil

• Humus

Why is compost good for soil?

• It helps soil stay healthy

• It makes soil dry

• It removes nutrients

• It makes soil hard

What is humus?

• A type of clay

• A type of rock

• Dead plants and animals that enrich soil

• A soil-damaging chemical

What do farmers do to keep soil healthy?

• Burn crops

• Remove some plants

• Use crop rotation

• Leave some spots on the land dry

• all of the above

How can humans harm soil?

• Feeding them compost

• Planting trees

• Cutting trees and using too many chemicals

• not watering the land

Subsoil is a layer of soil beneath topsoil?

• True

• False

What happens if soil is polluted?

• It may not grow more plants

• It loses nutrients

• It turns pale

• it shrinks and dies