Question

why relative hieght is not taken from the sea level​

Answer 1

Answer:

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Explanation:

Mean sea level (MSL) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The term above sea level generally refers to above mean sea level.

Sea level is the base level for measuring elevation and depth on Earth.

The ocean is one continuous body of water, its surface tends to seek the same level throughout the world. However, winds,currents, river discharges and temperature prevent the sea surface from being truly level.