For which of the following problems would growing and maintaining cover crops be an appropriate solution? (2 points) I. Erosion is thinning the soil on a farm.
II. The organic matter and nutrients in the soil on a farm are being depleted.
III. The soil on a farm is becoming arid due to slash and burn techniques.
II only
I and II only
I and III only
I, II, and III

In order to maintain a crop cover, an appropriate solution would be to protect it from the erosion that leads to the thinning and also to protect the soil for the farm can be protected from aridity by the use of slash and burn technique.

Hence the option I and III are correct.

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I and II only

Explanation:

Cover crops are planted in order to protect the soil when the main cash crop is not being planted which means that they are not planted to be harvested and can be planted after the cash crop is harvested.

The two main purposes of cash crops are to protect the soil from erosion and to improve soil fertility. Their presence reduces surface runoff of soil when it rains and slows down rain before it hits the ground at force and splits soil.

Some cover crops are planted to improve soil fertility because they improve the level of nutrients in the soil and they can also be ploughed before they mature causing them to decay and add organic matter to the soil.