In popular language, “ocean” and “sea” are used interchangeably. Sea water is 220 times saltier than the fresh lake water. If the salt in the sea could be removed and spread evenly over the Earth’s land surface it would form a layer more than 500 feet thick, about the height of a 40-story office building. Some scientists estimate that the oceans contain as much as 50 quadrillion tons (50 million billion tons) of dissolved solids.
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