Answered

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Mr. Green wants to teach his students about an interaction between Earth's biosphere and geosphere. Mr. Green had his

students collect soil samples from various areas of the school campus. The students noticed that the upper layer of the soil in

the wooded area of the campus was darker than the upper layer of the sandy playing field. Why would there be a difference in

color in the upper layer of the two soil samples?

A. The soil in the wooded area was made primarily of organic matter and not rock particles

B. The soil in the wooded area was made primarily of rock particles and not organic matter.

c. There is less erosion on the playing field due to fewer plants growing on the field.

D. There is more erosion in the wooded area due to more plants growing in the area,

Sagot :

Answer:

The correct answer is OPTION A

Explanation:

Topsoil, which is the upper layer of the soil, is high in organic matter, fertility, and soil life. Generally, the wooded area would contain more decomposed dead plants which would contribute to making the upper layer of the soil darker compared to the sandy playing field. Though the parent material is the starting point for most soil development and the color of the soil could be attributed to the type of rock particles that weathered to form the soil. However, the darker soil in the question above indicates a greater percentage of organic matter has finished the process of breaking down into humus.

While erosion could be aided generally by the soil texture and structure. Erosion could easily take place at the sandy playing field than it would at the wooded area of the campus due to the soil compactness. The coarser the soil texture the smaller is the resistance of the soil to erosion.

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