Selenium contamination of western soils is related to
A)the application of chemicals by farmers.
B)reliance of natural precipitation with no irrigation.
C)concentration of a natural element in the soil through irrigation drainage collection.
D)drainage of industrial runoff into agricultural areas.
E)overgrazing by livestock.

Question

Quizplus · Accepted Answer

Selenium is a naturally occurring element that can concentrate in soils through drainage from irrigated areas. Overuse of irrigation for agriculture can lead to the build-up of selenium in the soil, which can then contaminate groundwater and affect plant and animal health. It is not related to chemical application by farmers, reliance on natural precipitation, drainage of industrial runoff, or overgrazing by livestock.

Selenium Contamination of Western Soils Is Related to