Try looking at a globe of the Earth from a distance of 3 inches, and then a distance of 12 feet, and reconcile the % of ocean coverage. The discrepancy comes from the fact that the closer you are to the Earth, the less of the globe you can see, so an ocean will look larger in proportion to what is seen. (Different satellite altitudes.) This is called geometry.
Try looking at a globe of the Earth from a distance of 3 inches, and then a distance of 12 feet, and reconcile the % of ocean coverage. The discrepancy comes from the fact that the closer you are to the Earth, the less of the globe you can see, so an ocean will look larger in proportion to what is seen. (Different satellite altitudes.) This is called geometry.