Soil and Its Importance Quiz

What is the process called when weather, water, and living things break down rocks to create soil?

• Erosion

• Weathering

• Sedimentation

• Deposition

Why are earthworms important to soil?

• They eat plants

• They add water to the soil

• They mix the soil and add nutrients

• They remove rocks from the soil

Which of the following is NOT a reason why soil is important?

• It provides nutrients for plants

• It is a habitat for organisms

• It creates rocks

• It provides support for plants

What is the upper soil surface that is best for plant growth?

• Bedrock

• Subsoil

• Topsoil

• Sand

Which component of soil contains tiny particles that hold water well and provide nutrients?

• Sand

• Clay

• Rock

• Silt

What is the role of humus in soil?

• Provides structure

• Adds nutrients

• Holds water

• Provides no nutrients

Which soil component is made up of small grains of worn-down rock and does not hold water well?

• Silt

• Clay

• Sand

• Humus

What are the layers of soil under the topsoil called?

• Humus and Sand

• Air and Water

• Subsoil and Bedrock

• Clay and Rock