Water is all around us. It is colorless, odorless and tasteless. The air we breathe contains water. Water determines the climate of a region. Nearly 80% of the surface of the earth is water. Water is used for transportation, heating, cooking, industry and many other uses. We use water in so many ways that we take it for granted.
Ninety-seven (97%) percent of all water on earth is saltwater. Humans cannot drink salt water and it is costly to remove the salt, so we use very little ocean water for drinking.
Two (2%) percent of all the water on earth is glacier ice at the North and South Poles. This ice melts down into fresh water but is too far away from people who need it.
One (1%) of all the water on earth is freshwater for us to use. It should be enough to meet our needs if we take care of it. This means that we must be careful to use water properly and keep natural sources clean. Water cannot be destroyed. It simply changes form. From solid ice to liquid to steam in any order.
TODAY, THE AMOUNT OF WATER ON EARTH REMAINS EXACTLY THE SAME AS IT WAS BILLIONS OF YEARS AGO, NO MORE, NO LESS!
Water is present on earth in three forms: SOLID, LIQUID AND GAS (VAPOUR).
Ice is solid and strong. Water freezes at 32 degrees Fahrenheit (0 degrees Celsius).
Liquid is fluid and wet.
Steam occurs at 212 degrees Fahrenheit (100 degrees Celsius). It is wet, weightless and hot.
Water vapor is present in the air at all temperatures.
NEXT TO THE AIR WE BREATHE, WATER IS OUR MOST IMPORTANT NEED! ALL LIVING THINGS NEED WATER.
The human body is made up of about 70% water. Every system in our body needs water.
- WATER makes up 83% of our blood.
- WATER helps us digest food.
- WATER transports body wastes.
- WATER lubricates body joints.
- WATER keeps our temperature correct.
Human beings can live longer without food than they can live without water. Each day humans must replace about 2.5 quarts (2.4 litres) of water. Drinking returns only part of it. The rest of the water is taken by the body from the foods we eat. Water moves in a never ending cycle