Which of these descriptions involves an example of a nonrenewable resource?
a. kaolin material is used to make porcelain.
b. trees grow back after a forest fire.
c. solar energy reaches earth’s surface.
d. winds are produced by temperature differences.

a. kaolin material is used to make porcelain i think Others can be regenerated, and minerals and the like are basically not regenerated.

a. kaolin material is used to make porcelain.

Explanation:

Renewable resources are resources that can be renewed, like the solar energy or the eolic energy that even if you use it and take advantage of it will no run out, trees are also a renewable material since it can be grown back, the only example that is not renewable is kaolin which is a mineral that is used to form porcelain, and as it takes thousands of years to form.