Soil can be depleted of nutrients.
Potassium carbonate is a valuable nutrient for plants.
Soil can be depleted of potassium carbonate.
Soil can be depleted of which of the following?

a. Potassium carbonate
b. Chlorophyll
c. neon
d. sedimentary rocks
e. carbon monoxide
f. helium
g. Organic compounds
h. vegetation