11. How do roots of plant break down rocks?
A. They heat the rocks
B. They split the rocks apart
D. They leave materials on the rocks
C. They absorbed rock particles
12. How does temperature breakdown rocks?
A Rocks break when it is cooled.
B. Rocks break when it is heated.
D. Rocks break when it is heated and then cooled.
C. Rocks break when it is not exposed to water.
13. How does temperature break down rocks?
A. Rocks break when they are hammered.
B. Rocks break when there is no more sun.
C Rocks break when they are heated by the sun D. Rocks break when they are heated and then cooled
14. How long does it take to form just an inch of soil?
B. 1,000 years
C. 100 years
D. 10,000 years
15. You see that some tiny plants are growing on the rocks in the garden. What do you think will happen after a long period of time?
The rocks will
A. grow bigger
B. become very hard
C. gather more minerals D. weaken and break apart
16. Plant serves as agents of weathering. Which of the following statements support this idea?
A Falling of leaves cause rocks to break.
B. Decaying trunks of plants cause the rocks to break
C Root of plants that grow in rocks and cause them to break.
D. Branches of plants cause the rocks to break when blown by the winds.
A 10 years​