Answer :
Mean Sea Level (MSL) is the datum for measurement of elevation and altitude. Mean Sea Level is the equipotential surface of the Earth as described by the WGS84 geoid.
Tide stations and satellite laser altimeters are the main tools used to monitor sea level. The height of the sea as measured along the shore in relation to a particular place on land is what tide stations all around the world tell us about what is happening locally. By asking pupils to respond to three different kinds of questions about a text—factual, inferential, and universal—the Levels of Questions technique aids students in understanding and interpreting it. The height of the shoreline—the boundary between the ocean and the land—is referred to as sea level. Land that is higher than this altitude is above sea level, and land that is lower is below sea level.
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