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Why does the ocean look blue-green in color, but not a glass of water? A. Because...

Why does the ocean look blue-green in color, but not a glass of water?
A. Because all water reflects blue and green light
B. Because all water absorbs all red-light
C. Water absorbs red-light when there is a large depth of it (~30 meter)
D. Water reflects green light if it is shallow

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