Soil erosion is a natural process that occurs as a result of the hydrologic cycle. When rainwater falls, it flows downhill as runoff toward an accumulation of water. As it flows, the water can carry away the topsoil of a field. Topsoil is the top layer of soil that
contains a high concentration of nutrients to support plant growth.
Scientists are designing an investigation to determine changes that occur in a forest that has been cleared. As part of their
investigation, they want to collect data about soil erosion. Which investigation best provides data on soil erosion?

A test rainwater to evaluate the amount of acid rain in the area
B. measure the depth of topsoil before and after rainstorms
c. determine the amount of nutrients found in the topsoil of other forests
OD. count the number of trees that grew in the area before it was cleared

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