Sea level is constant over long periods of the earth's history,and that is why it is used as a major datum for mapping elevations.

Question

Quizplus · Accepted Answer

Sea level has not always been constant over the earth's history. It has fluctuated due to factors such as changes in ice volume and plate tectonics. However, it is currently used as a major datum for mapping elevations due to its stability over shorter time frames.

Sea Level Is Constant Over Long Periods of the Earth's