What have scientists concluded about Earth based on the average density of Earth and the average density of the crust?
A) that the crust must be made of heavy metals in order to account for the missing density
B) that the core must be made of heavy metals in order to account for the missing density
C) that the center and the core are the same density
D) that their understanding of what lies at the center of Earth is faulty
Correct Answer:
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Q51: Q52: Earth's earliest fossils are as old as Q53: Most of the heat loss from Earth's Q54: The average density of the rocks near Q55: At 40 kilometers depth the temperature is Q57: Which geologic time period are we currently Q58: The earliest mammal fossils are about _
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