Question

which of the following is not human - caused groundwater pollution? a) water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. b) water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. c) water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d) water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank. question 9 (5 points) which material most likely would form an aquiclude? a) gravel b) sandstone c) sand

Explanation:

Landfills, hydraulic fracturing, and septic - tank drainage are human - made sources of pollution. Dissolving elements from surrounding rock is a natural process. Aquicludes are low - permeability materials, and among gravel, sandstone, and sand, sandstone has relatively lower permeability.

Answer:

For the first question: B. Water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock.
For the second question: B. Sandstone