Buying new clothes so that your friends will stop making fun of your old clothes a positive reinforcement or negative reinforcement?

It depends really, if you liked your old clothes better and it was really bothering you with your friend making fun of you so you gave into it, that is negative however if you are comfortable with the new clothes and you are happy that your friend has laid of, then it is positive but don't change yourself for someone else.

according to hess's theory, when the magma cooled, it would expand and push the tectonic plates apart. it would push the north and south america plates to the west and eurasia and africa ones to the east. the atlantic ocean would get wider but the coastlines of the masses would stay the same.

harry hammond hess was a geologist and a united states navy officer in the second world war. he is considered to be one of the founding fathers of the theory of plate tectonics. he is known for his theories on sea floor spreading, stating that the movement of the continents was the result of see floor spreading. the continents are attached to the plates and do not move separately. the plates themselves shift and change shape, carrying the continents along.