Problem 8
Which of the following can be caused by acids produced by plant roots? A) soil erosion B) oxidation C) mechanical weathering D) chemical weathering
Problem 9
Which of the following is the R horizon? A. topsoil C. bedrock B. humus D. gravel
Problem 10
Which of the following is an agent of mechanical weathering? A) animal burrowing B) carbonic acid C) leaching D) oxidation
Problem 11
In which region is chemical weathering most rapid? A) cold, dry C) warm, moist B) cold, moist D) warm, dry
Problem 12
What is a mixture of rock and mineral fragments, organic matter, air, and water called? A) soil C) horizon B) limestone D) clay
Problem 13
What is organic matter in soil? A) leaching C) horizon B) humus D) profile
Problem 14
What is done to reduce soil erosion on steep slopes? A) no-till farming B) contour farming C) terracing D) grazing
Problem 15
Which type of weathering-mechanical or chemical-you would expect to have a greater effect in a polar region. Explain.
Problem 16
Describe ways that humans affect Earth's soil. How can damage to soil be reduced?
Problem 18
Why do rows of trees along the edges of farm fields reduce wind erosion of soil?
