Question

over a period of time,high and low level of the sea are observed and calculated average level which is known as
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Answer 1

Answer:

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Explanation:

The term Mean Sea Level (MSL) can also refer to a tidal datum, or frame of vertical reference defined by a specific phase of the tide. Tidal datums are locally-derived based on observations at a tide station, and are typically computed over a 19-year period, known as the National Tidal Datum Epoch (NTDE).