Aeriskyungsooviz
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Cause about three percent of earth is fresh water while 97% is salt water that consist the earth surface​

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Todorokishoto2006viz

Earth is nearly ¾ water.

97.5% of that is salt water only 2.5% is freshwater. 97.5% of all Earth's water comes from our oceans. While salt water is not good for humans to drink, it does provide a home for many marine animals.