Which of the following statements about erosion is true?
a. erosion occurs as a result of drastic changes in temperature.
b. erosion occurs when wind or water moves over sediment, soil, or rocks.
c. physical and chemical are the two types of erosion.
d. movement is not required for erosion to take place.

Your best answer is b, erosion occurs when wind or water move over sediment, soil, or rocks.

b. erosion occurs when wind or water moves over sediment, soil, or rocks.

Explanation:

Erosion is a surface process that is based on the action of the geomaterial on the surface of the earth may be man-made or induced by nature itself.  And it does not involve the movement of materials as in weathering.  Breaking down of oil into various particles and then getting transported by the winds, water, ice and other agents of change.

The correct answer should be brand c.