2. What do you understand by Mean Sea Level?
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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. ... The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
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it is 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.
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