Answer the following question: Fact 1: Being exposed to wind can cause erosion of soil. Fact 2: Erosion is the natural wearing away. Given the two facts above, being exposed to wind can cause the natural wearing away of what?

Choices: (I). light. (II). rocks. (III). wind. (IV). soil. (V). water. (VI). roots. (VII). cracks. (VIII). earth.
Answer:
(IV).