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After rain, water soaks into the ground and is added to the groundwater. this process is known as a. groundwater pollution. b. groundwater recharge. c. groundwater recycling. d. groundwater filtration.

What is the meaning of the prefix un-? a. over b. above c. under d. not

During which stage of engine operation does the piston squeeze the air and fuel mixture that’s trapped in the combustion chamber a. intake b. power c.compression d. exhaust