Independent variables don't change
Dependent variables change as a result of the alteration made during the experiment
The one after metamorphic rock is melting.
7 protons. As well as in nitrogen-14. The difference between nitrogen-14 and nitrogen-15 is in a number of neutrons. In nitrogen-14 - 7 neutrons, in nitrogen-15 - 8 neutrons.
Groundwater adds water to lakes, rivers, and oceans.
