The two most abundant elements that make up the salinity of seawater are

A) sodium and potassium.
B) chlorine and sulfur.
C) calcium and sulfur.
D) chlorine and sodium.


Answer: D

Physics & Space Science

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Two beams of coherent light are shining on the same piece of white paper. With respect to the crests and troughs of such waves, darkness will occur on the paper where:

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If a solid has a half-filled valence band, which of the following would it be?

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