G 52. You are tasked to separate out each component a beaker of mixed materials. Use your knowledge of laboratory techniques and of common materials to explain how you would isolate each component under each heading. All solids should be dried and all liquids should be isolated or evaporated. (4 points for each response, 20 points total)

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.