Chapter 10 Internet Activity Wacky Water Water is the most abundant chemical compound on earth.
Water covers three-fourths of the planet's surface.
Polar ice caps contain most of the world's fresh water in the form of ice and snow. After nitrogen and oxygen, water is the third most abundant substance in the earth's atmosphere. Yet, as common as water is, it is one of the strangest chemicals known. Unlike most other liquids, water flows faster under high pressure than under low pressure. Ice is unusual because it floats on liquid water.