The theory of plate tectonics.
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the 20 states into which darius divided the Persian empire
Two objects both can incur force upon each other. Newton's Third Law of Motion states that, "For every action, there is an equal and opposite reaction."
the geography of Greece made more independent communities (city states) which helped foster participation in political affairs which gave them their own laws and military power.
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well typically Greece was divided into many big and small city states run by many leaders. This developed to be their flaw because 1 it takes so long to gather the troops and 2 a whole bunch of leaders do not get along well, especially Greek leaders in that age. When Persia came it was up to the Sparta alliance to take care of things as was designed but due to the city states they were slowly but surely picked off and destroyed by the numerous numbers of the Persian army.