Under the Sea: How much do you know about our watery planet? Take our quiz!

The ocean is a watery and wonderful place. How much do you know about it?

1. How much of the world’s surface is covered in water?

Mosa'ab Elshamy/AP/File
A couple observe the sunset as ocean waves crash behind them on the corniche of Rabat, Morocco (Feb. 8, 2016).

80

71

45

20

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