$8
The ocean covers more than 70 percent of the surface of our planet. About 97 percent of ALL the Earth’s water is in the oceans. Roughly 60% of the human body is water. A loss of just 4% of total body water leads to dehydration, and a loss of 15% can be fatal. Likewise, a person could survive a month without food but wouldn’t survive 3 days without water. This crucial dependence on water broadly governs three kingdoms of life forms: human, animal, and plant.
Water is unlike any other element on Earth. It can exist in three forms simultaneously: liquid, solid, and gas. It expands when it freezes. Water will dissolve everything, so all water contains some dissolved substances.