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what is the difference between sea level and mean sea level?

Sea level is the level of the sea's surface used to measure the height of geographical features such as mountains,hills etc.
Mean sea level refers to the average height of the surface of the sea, i.e, halfway between the high tide and the low tide.

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sea level,the level of the sea, which serves as the datum used for measurement of land elevations and ocean depthsMAIN SEA LEVEL-A "mean sea level" is imaginary. It is not possible to determine the average sea level for the entire planet. The sea level also changes over time when measured at just one location.

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