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Suppose that in one hour Dewey can produce either 10 bushels of corn or 20 yards of cloth. Dewey's opportunity cost of producing one bushel of corn is 1/2 yard of cloth.
Plutonic Rocks
Intrusive igneous rocks that crystallize deep underground from magma, such as granite and diorite.
Continental Crust
The relatively thick part of the Earth's crust that forms the large landmasses. It is generally older, less dense, and composed mainly of granite.
Plate Boundary
Boundaries at the junction of two tectonic plates, frequently linked with earthquakes and volcanic actions.
Appalachian Mountains
A major mountain range in eastern North America, extending from the Canadian Maritime provinces to central Alabama in the United States.
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