51. Which of the following soil types is characterized by a high content of organic matter and a dark color?
a. Sand
b. Clay
c. Silt
d. Loam
52. What is the term used to describe the upper layer of soil that is rich in organic matter and nutrients?
a. A horizon
b. B horizon
c. C horizon
d. R horizon
53. Which of the following is a measure of the ability of soil to resist changes in pH?
a. Cation exchange capacity
b. Electrical conductivity
c. Total dissolved solids
d. Soil organic matter
54. What is the term used to describe the process of compacting soil by the weight of heavy machinery or foot traffic?
a. Leaching
b. Erosion
c. Compaction
d. Aeration
55. Which of the following soil types is characterized by a high content of sand and a low content of organic matter?
a. Sand
b. Clay
c. Silt
d. Loam
