1. measures the decay of a rock or fossil to measure the age absolute dating or relative dating?

2. gives the approximate age of a fossil or artifact. absolute dating or relative dating?

3. scientist use their knowledge of the half-life of carbon and uranium isotopes to measure the age of the rock or fossil. absolute dating or relative dating?

4. gives scientist an exact age of a rock fossil. absolute dating or relative dating?

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.