https://www.youtube.com/watch?v=rqmzhgbPa6I
Fathoming the forces that determine global sea levels can be daunting. We present a guide to the basics of ocean surface topography. Full story: https://climate.nasa.gov/blog/2990/sea-level-101-what-determines-the-level-of-the-sea/ Video credit: NASA/JPL-Caltech