Iiiiiiiiidonnnnnntttttknnnnnowwwwww
I'd say stone tools. Stone can be chiseled or left alone and be used as a weapon to defend one's self, or as a way of getting food.
I don't know if this question is missing some multiple choice options that go along with it, but...
One plate will subduct (go under the other plate), creating a trench or subduction zone. The other plate goes over the subducted plate, creating raised ground. This is how mountains and volcanoes are made.
Answer:
Oxygen atoms contain 16 times more mass than Hydrogen atoms.
(a brainliest would be appreciated)
