In terms of composition,nine elements compose approximately what percentage of the earth's crust?
A) ≈ 50%
B) ≈ 75%
C) ≈ 90%
D) > 96%
Correct Answer:
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A)silicon and oxygen.
B)silicon,
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Q10: Silicates are compounds composed of
A)silicon only.
B)silicon and
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Q14: The second most abundant element in the
Q15: Which of the following correctly summarizes the
Q16: The three major structural parts of the
Q17: The most abundant element in the earth's
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