Sunday, September 18, 2011

Where does Water come from

At times when it hasent rained for awhile people are told to go slow with the amount of water that is being used, but other than rain where does water come from or even why does it rain in the first place

Well i thought i would tackle the where does water come from


Water comes from water

When the water in the lakes and oceans is evaporated by the heat of the sun and forms a vapour that joins together to form clouds. When the temperature is warm enough, the vapour condenses into drops of water which is what rain is made out of.

The rain falls onto the earth-onto land as well as back into oceans, lakes and rivers. From the water bodies it evaporates and the cycle starts all over. The water that is found on the earth is used by plants and often people as the water will eventually find its way to the water table.

More Technical

Water is a molecule which contains one oxygen and two hydrogen atoms connected by covalent bonds.

Water comes in different forms, its a liquid at ambient conditions, its solid state its ice, and gaseous state (water vapour or steam). Water also exists in a liquid crystal state near hydrophilic surfaces.

So now we know that some other interesting information

Water covers 70.9% of the Earth's surface. On Earth, it is found mostly in oceans and other large water bodies,

1.6% of water below ground in aquifers and 0.001% in the air as vapour

clouds (formed of solid and liquid water particles suspended in air), and precipitation.

Oceans hold 97% of surface water,

Glaciers and polar ice caps 2.4%, and other land surface water such as rivers,

Lakes and ponds 0.6%.

A very small amount of the Earth's water is contained within biological bodies and manufactured products.

So what happens is that water on Earth moves continually through a cycle of evaporation or transpiration , precipitation, and run off, usually reaching the sea.