The two most abundant elements in the crust are

A. iron and aluminum.
B. oxygen and silicon.
C. sodium and calcium.
D. magnesium and potassium.


Answer: B

Environmental & Atmospheric Sciences

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What will be an ideal response?

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A. during cellular respiration. B. when the sodium-potassium pump moves potassium ions into cells. C. when one of ATP's phosphate groups is removed, leaving ADP. D. when ADP is converted to ATP.

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