Water: a special substance

IceWater

Steam

Water is the only substance that occursWater is the only substance that occurson the earth in all 3 states.on the earth in all 3 states.

H, He and O are the 3 most H, He and O are the 3 most common elements in the universe.common elements in the universe.

The earth‘s surface is The earth‘s surface is covered 70-75% with covered 70-75% with water.water.

The human body is made up of The human body is made up of about 75% water.about 75% water.

In the course of 100 years a single water molecule spends about 98 years in the sea.

18 months as ice

2 weeks in rivers or lakes

Less than a week in the atmosphere