Soil

Humus is a mixture of.....

• rocks and sand

• the remains of plants and animals

• water and pebbles

• silt, sand, and clay

Which of the following are the layers of soil?

Select all that apply.

• topsoil

• bedrock

• plants

• subsoil

Which of the following are used for soil formation?

Select all that apply.

• sun

• water

• snow

• wind

• trees

A class is studying how water helps change rocks into soil. Which of these can cause soil to form?

• Water vapor collects in clouds.

• Water breaks rock into small pieces

• Water is found in the ocean.

• Water can make hot steam.

Which step of the soil formation does NOT belong?

• Rocks are broken down by wind, water, ice, and plant roots.

• Plants and animals die.

• Dinosaurs created soil.

• Weathered rocks mix with humus.