Post on 13-Jul-2015
transcript
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