Science D Quiz 5A

Which things make up soil?

Complete the sentence.

__ is the organic matter found in soil that comes from dead plants and animals.

Sort the ideas to tell which soil layer is being described.

Groups:

(a) Topsoil

,

(b) Subsoil

,

(c) Bedrock

• contains mainly humus and tiny living creatures

• the bottom layer under the soil

• the uppermost layer of soil

• the middle layer of soil

• is a sheet of rock that sometimes breaks with chunks of it mixing with the soil

• contains a mix of humus, rocks and minerals

What are the three main types of soil?

Complete the sentences to tell more about the different methods of caring for soil.

The method that involves letting crops rot back into the soil to add back lost nutrients is called ​ (a)   .

The method that uses chemicals to add nutrients back into the soil is called ​ (b)   .

The method that involves changing which crops are planted on a piece of land each year is called ​ (c)   .

• lying fallow
• fertilizing
• crop rotation

Match each process with its description.

pieces of rock break off and are moved - (a)  

pieces of rock wear away or break down - (b)  

• erosion
• weathering

Rainwater wearing down rock is an example of...

• chemical weathering

• physical weathering

Animals burrowing and breaking down rock is an example of...

• chemical weathering

• physical weathering

Water seeping into cracks in rock, freezing, and then causing the rock to break is an example of...

• chemical weathering

• physical weathering