Sea Level- <span>the level of the sea's surface, used in reckoning the height of geographical features such as hills and as a barometric standard.
Elevation- </span><span>the action or fact of elevating or being elevated
</span> -<span>height above a given level, especially sea level.</span>
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During 1750-1900, people from around the world challenged established government structures, and this led to a great deal of political, economic, and social change. For many of the following Revolutions, Enlightenment ideas directly influenced their advent.
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