Practice explaining how soil forms, identifying its main components, and describing the factors that affect soil development.
Read each problem carefully. Answer in complete sentences and show your thinking when needed.
How soil forms and what it is made of
Earth Science - Grade 6-8
- 1
Describe how weathering helps form soil from rock.
- 2
List the four main components of soil.
- 3
Explain the difference between soil and weathered rock.
- 4
A sample of soil contains a large amount of decayed plant material and looks dark in color. What soil component is especially abundant in this sample, and why?
- 5
How do plant roots help with soil formation?
- 6
Compare sand, silt, and clay by particle size.
- 7
Why does soil with a lot of clay usually hold more water than soil with a lot of sand?
- 8
Name two factors that affect the rate of soil formation and explain one of them.
- 9
What is parent material in soil formation?
- 10
A hillside has thin soil, while a nearby flat area has thicker soil. Give one reason this difference might occur.
- 11
Why is soil considered a natural resource that forms slowly?
- 12
Explain why healthy soil is important for plant growth.