IntER vs. IntRA...What's the difference?
forces are those
atoms (ions in
compounds / molecules.
forces are those between atoms/ions
compound/molecule

Which metals are called noble metals

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.

Which is true according to the law of conservation of energy