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4.3 Reinforcing Key Concepts

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4.3 Reinforcing Key Concepts
SECTION
HUMAN ACTIVITIES AFFECT SOIL.
4.3 Reinforcing Key Concepts
BIG IDEA Natural
KEY CONCEPT
forces break rocks apart and form soil, which supports life.
Human activities affect soil.
1. Soil is a necessary resource. Soil
helps sustain life on Earth. Describe how soil is
connected to you.
2. Land-use practices can harm soil. The
ways people use land can affect the levels of
nutrients and pollution in the soil. Define each term below and describe how each one relates
to soil.
a. Overgrazing
3. Soil can be protected and conserved. Farmers
use many different methods for
conserving soil. Two of these methods are illustrated below. In the space provided, identify
each method and write a brief description.
CHAPTER 4
Weathering and Soil Formation
Copyright © by McDougal Littell, a division of Houghton Mifflin Company
b. Desertification
EARTH’S SURFACE, CHAPTER 4, REINFORCING KEY CONCEPTS 249
249-249-sean-urb-a0403-rkc 249
3/10/04, 9:52:47 AM
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