5. When water, people, animals wear away bits of rocks, which of these is going
on?
A. erosion
B. weathering
C. mountain climbing
D. fermenting

6. Which of the following is NOT an example of physical weathering?
A. Burrowing of animals
B. Smashing with heavy instruments.
C. Splitting due to root penetration.
D. Decay of plants and animals in rocks

7. What Is formed with the continuous weathering of rocks?
A. mountain
B. flatlands
C. soil
D. valley

8. How do plants cause weathering?
I. By changing the temperature
II. By splitting due to root penetration.
III. By dissolving the rock in water.
IV. By producing acid that dissolves some parts of the rock.
A. I and II
C. I and III
B. II and IV
D. II and III

9. Which of the following describes chemical weathering?
A. It is also known as physical weathering.
B. It occurs with the exposure of rocks to physical forces.
C. It is the breaking of rocks, forming new substance.
D. It is the ordirnary breaking down of rocks without forming a new
substance.

10. What is the effect of soil formation to human beings in producing food?
A. We will live on bedrock
B. Plants will not grow well because its rocky.
C. The surface of the earth will be irregular.
D. There will be soil to be used for planting.​