6th Grade Soil & Human Impact

Earthworms are important to soil because they eat decaying material breaking soil into smaller pieces. How do they help create organic material for healthy soil?

• Worms help with chemical weathering.

• Worms break up rocks into smaller pieces.

• Worms dry out the soil by drinking the water in layers.

• Worms eat decaying material and break it into smaller pieces.

The picture show different soil layers. Which layer most likely contains the most rocks and least of organic matter?

• W

• X

• Y

• Z

Which of the following correctly lists the layers of soil from top to bottom?

• top soil, organic material, subsoil, bedrock

• organic material, top soil, subsoil, bedrock

• top soil, organic material, bedrock subsoil

• organic material, top soil, bedrock, subsoil

What part of Earth's soil is located underneath the horizon layers or after the parent material?

• bedrock

• humus

• leaf litter

• parent material

Which of the following is the largest mineral particle found in soil?

• peat

• dirt

• sand

• silt

Daniel has a garden with weeds. He wants the weeds gone but not the earthworms because earthworms

• eat the leaves of plants but give the plants water in return.

• protect plants from predators by releasing poison in the soil.

• travel long distances and help move plant seeds to new areas.

• break down organic material into nutrients that plants use to grow.

Which soil horizon sample is most likely correct?

• 
• 
• 

Over long periods of time, weathering and biological activity combine to create

• minerals

• crystals

• soil

• bedrock

On the diagram shown, which layer contains the majority of the bacteria, fungi, worms, and other organic matter?

• W

• X

• Y

• Z

The land around Georgia's coastal island beaches has sandy soil. Sandy soil has a lot of

• clay and leaves.

• rocks and minerals.

• worms and organic matter.

• decomposed organic matter.