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Under the geocentric model, the Sun, Moon, stars, and planets all orbited Earth. The geocentric model was the predominant description of the cosmos in many ancient civilizations, such as those of Aristotle in Classical Greece and Ptolemy in Roman Egypt.
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At first, explorers were looking for a shorter route to Asia. They hoped that they would find this route by sailing west. As the European countries claimed land in the New World, this gave people a chance to go there to spread Christianity.
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The Battle of Marathon was significant because it proved to the Greeks that the Persians were not 'invincible', which boosted the moral of the Greek troops, increasing their confidence to incline themselves in a common cause if the Persian attacked again (which they would)
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