Nutrient rich soil is
a. usually infertile
b. found in river deltas
c. found near the base of mountains
d. contains low levels of potassium (k)

Answer : The correct answer is- B. found in river deltas.

River delta is a landform that is produced by the deposition of sediments, which are brought by water flowing in the river.

River deltas contain nutrient rich soil because sand from different parts of land is brought by the flowing water, which makes them fertile.

Thus, option B) is the right answer.