Question

What do you mean by mean sea level? for 4 marks
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Answer 1

Answer:

Mean sea level (MSL) (often shortened to sea level) 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. ... Sea levels can be affected by many factors and are known to have varied greatly over geological time scales.

Answer 2

Answer:

Mean sea level (MSL) (often shortened to sea level) 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.