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2. Which of the human activities cause soil erosion

A. digging, planting trees, construction, grazing

B. illegal logging, quarrying, construction of buildings

C. planting trees, strip cropping, terracing, reforestation

D. illegal logging, strip cropping, quarrying, terracing

3. Which of the following is an example of mechanical or physical weathering?

A. the action of acids in rocks

B. the growth of lichens on rock

C. the combination of oxygen with iron and other minerals in rocks

D. the contraction and expansion of rocks due to temperature changes


4. How does temperature weather rocks?

A. Rocks are at different temperature.

B. Rocks are heated greatly all the time.

C. Rocks are heated and cooled continuously.

D. Rocks are cooled tremendously all the time.


5. What are the causes of soil erosion?

A. water, wind, man and animals

B. water, reforestation, terracing

C. landslides, floods, strip cropping

D. building windbreak, man and animals .


6. How does temperature breakdown rocks?

A. Rocks break when it is cooled.

B. Rocks break when it is heated.


C. Rocks break when it is not exposed to water.

D. Rocks break when it is heated and then cooled.

7. Which is made up of tiny bits of rocks with decaying plants and animals?

A. rocks .

C. soil
.D. humus

B. gravel


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