The Ocean
NASA
Looking at our Earth from space, it is obvious that we live on a water planet. Ocean covers over 70 percent of Earth's surface and contains about 97 percent of Earth's surface water. How much do you know about our ocean?
Answer questions like ...
- NASA has been measuring sea surface height from space since 1992. Over that period, average global sea level has:
- Sea level isn’t level at all. The ocean has hills and valleys similar to what we see on the land's surface. Ocean surface highs and lows are known as:
- Measurements of Earth’s gravitational field permit topographic, or surface, mapping of the ocean floor.
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