Answer:
Appalachian Mountain Range
Explanation:
The Appalachian Mountain Range runs through most of the Eastern United States, and had previously served as the border for the 13 colonies back in the colonial age.
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Gravity keeps the water and yourself from falling off the planet into space.
The subject of science is very broad. With that being said, I think there is no official regulatory board that decides the branches of science. Scientific developments are products of joined efforts of different scientists. These scientists could rebuke another's work provided there is evidence. As long as the theory is generally accepted by the scientists and no one rebukes it effectively, then it is a generally accepted fact and everyone adapts it.
Hence, the answer is B.
