HowStuffWorks Show: Episode 4: Ocean Water
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Water is everywhere, but not all is fresh water. Learn why the oceans become saltier as time passes and how machinery can get the salt out in this clip from the "HowStuffWorks" show on Discovery... (more info)

Water is everywhere, but not all is fresh water. Learn why the oceans become saltier as time passes and how machinery can get the salt out in this clip from the "HowStuffWorks" show on Discovery Channel.

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