20. Water molecules are polar with ends that exhibit partial positive and negative charges. Such opposite charges make water molecules attract each other through bonds called

The clouds are grey and ground is wet. a quantitative b qualitative

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.

What does a numerical subscript following an element in a chemical formula mean?