The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.
<span>The nation's largest railroad center was found in Chicago. Chicago is considered as the most important center of railroads in North America. Chicago has been the most significant interchange point of commercial transportation between the nation’s great railroads.</span>
The most important geographic factor is the environmental impact of a New Sea port and if it has easy access to the oceans into transportation from England points to come to it. The mouth of the Mississippi River in New Orleans and the Seaport have severely negatively impacted the environmental area. Hurricanes can hit the area and for example New Orleans is mostly below sea level, this caused a major disaster in the area of which they are still feeling the economic impact of not being prepared for such a major catastrophe .
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The Persian Empire was an empire that stretched from India to Europe from 550 B.C.E. to 331 B.C.E. It was ruled by a series of monarchs. An empire is defined as a geographically extensive set of states or peoples that are ruled either by a monarch or by an oligarchy, a small group of ruling elites.
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