Which of the following was probably most important in the formation of dark, fertile soil that is good for farming?
A B C D
plant decomposition radioactive decay water erosion wind erosion
Question: Which of the following was probably most important in the formation of dark, fertile soil that is good for farming?
(A) plant decomposition
(B) radioactive decay
(C) water erosion
(D) wind erosion

Answer: (A) plant decomposition
Answer: (C) water erosion
Question: Which of the following was probably most important in the formation of dark, fertile soil that is good for farming?
(A) plant decomposition
(B) radioactive decay
(C) water erosion
(D) wind erosion
Answer: (A) plant decomposition