The gap in the rock record that occurs between folded or uplifted rock layers and a sedimentary rock layer on top of them is called a(n)

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg