How does an electrolytic cell work? OA. Two electrolyte solutions react to cause electrons to flow.
O B. A voltage applied across two electrodes causes electrons to flow.
OC. A salt bridge connecting two electrodes generates electrons.
O D. A spontaneous redox reaction at two electrodes causes electrons
to flow.

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. 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.