Weathering and Soil Formation

Soil formation begins with the weathering of_______

• Humus

• Subsoil

• Litter

• Rock

Tags

NGSS.MS-ESS2-2

What is the first step of soil formation?

• humus decomposing

• nitrates being absorbed by the plant roots

• weathering of parent rock

• climate changing

Tags

NGSS.MS-ESS2-2

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

Humus is.....

• the dead parts of plants and animals in soil.

• A food we eat with pretzels.

• The tiny particles inside of soil

• The roots that come off of a plant and live in soil.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

The formation of soil is primarily the result of

What is weathering?

• The process of breaking down rocks by weather, water, and living things to create soil.

• The process of rocks, soil, and minerals being compressed and hardened over time.

• The process of rocks, soil, and minerals being transported by wind and water.

• The process of rocks, soil, and minerals forming through exposure to the atmosphere, water, and biological organisms.

Tags

NGSS.MS-ESS2-2

A gardener is adding topsoil to his garden to help keep his flowers healthy. As he pours the bags of soil, he wonders about the processes which caused the soil to be made. What happens third?

• Topsoil is formed.

• Dead leaves fall onto the ground.

• Bedrock is weathered into small pieces.

• Leaves and dead roots decay and are broken down.

• Organisms such as earthworms mix decaying matter with sediment.

Tags

NGSS.MS-LS2-3

Decayed organic material turns into dark colored material called __.

• litter

• clay

• humus

• soil

Weathering occurs fastest in

• cold, dry climates

• cold, wet climates

• hot, dry climates

• hot, wet climates

What is soil composed of?

• weathered rock

• minerals

• living things

• all of the above

Tags

NGSS.MS-LS2-3