Underwater Exploration: Answer Sub Multiple Choice Quiz University of Wisconsin Sea Grant
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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.

D. 35,800 ft.answer 1

2: What percentage of Earth's surface is covered by water?

A. 30%

B. 50%

C. 70%

D. 92%answer 2

3: The most deadly risk divers face underwater is:

A. Sharks

B. Anxiety and Panic

C. Malfunctioning equipment

D. Hypothermiaanswer 3

4: In what way is water at the surface different from water at great depth?

A. Temperature

B. Pressure

C. Visibility

D. All of the aboveanswer 4

5: The air we breathe is made up of what percentage oxygen?

A. 100%

B. 79%

C. 21%

D. 12%answer 5