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1: The greatest ocean depth at which life exists is:
A. 1,000 ft.
B. 2,500 ft.
C. 20,000 ft.
2: What percentage of Earth's surface is covered by water?
3: The most deadly risk divers face underwater is:
B. Anxiety and Panic
C. Malfunctioning equipment
4: In what way is water at the surface different from water at great depth?
5: The air we breathe is made up of what percentage oxygen?