It is the “average level of the sea where it meets the land. ” (Cambridge Online Dictionary) The level is measured through the year to make sure all tides and seasonal changes are included to get the full picture.
First records of sea level date back to the 1800s and continue up to present dates.
NASA monitors sea level through satellites and shares numbers on their website.
It is important to monitor sea level to understand water movement, monitor floods risk and manage climate change risks.
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