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 ...
- What is sea surface salinity?
- NASA has been measuring sea surface height from space since 1992. Over that period, average global sea level has:
- Tides are caused by: