Formation of Soil

Multiple Choice

Soil is a natural resource made of ...

• weathered rocks, water, air, and organic matter (dead plants and animal parts)

• weathered rocks, water, grass, and organic matter (dead plants and animal parts)

• weathered rocks, air, lava, and organic matter (dead plants and animal parts)

Multiple Choice

What is weathering?

• when it rains and snows

• the break down of rock into tiny pieces

• when the sun comes out

Multiple Select

Which of the following causes weathering? SELECT MORE THAN ONE!

• water

• wind

• ice

Multiple Choice

TRUE OR FALSE:

The rushing river that flows against the Grand Canyon caused the rocks to break down. This is known as weathering.

• True

• False

Multiple Choice

Which description demonstrates one way rocks weather to form soil?

• • A canyon with a river flowing through

• • Grassland that is used for grazing livestock

• • Leaves decompose to form the soil

• Earthworms make tunnels in the soil

A process in which decomposers (worms, bacteria, fungi) break down dead animals and plants. It becomes part of soil.

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Decomposition

Multiple Choice

How can a plant become a part of soil?

• • The plant’s roots can grow deep in the ground.

• • The plant’s seeds can drop on the ground and get eaten.

• • 
    The plant’s flower can stick pollen to a bee.

• The plant’s leaves can decompose after they fall.

Multiple Choice

A student sketched the formation of soil from rock. In this instance, soil formation is most likely caused by —

• • decomposition of rock from sunlight

• • decomposition of rock from plant roots

• weathering of rock from falling leaves

• weathering of rock from wind and rain