Question

Groundwater contaminants choose one:

a. are always toxic materials like arsenic, mercury, and lead.
b. dissipate quickly into the groundwater reservoir and often do not pose a problem.
c. like methane, arsenic, and salt may occur naturally in groundwater.
d. are all eventually removed by rock and sediment acting as natural filters.

Answer 1

Ground water contaminants, like methane, arsenic, and salt may occur naturally in ground water. Ground water accounts for 95% of the liquid freshwater on Earth, but having enough accessible ground water can be a problem. Ground water typically moves slowly within the ground through porous rock layers like the sandstone.