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Name: Ntak
Status: Student
Grade: Other
Location: N/A
Country: Vietnam
Date: Summer 2009


Question:
Is the water on Earth limited, or unlimited? Is there a day when the Earth will be completely dry?



Replies:
Quochuy

The total water supply on planet earth is fixed. There is no additional water being added to planet earth. So the amount of water available is 'limited'.

But the water is not being depleted either because it recycles.

Sea water evaporates to rain that falls to the earth, Gathers in rivers and flows down to the seas again (like the Mekong River) In an ever unending cycle.

Even human water consumption is re-cycled. Human waste products are removed from water in water treatment plants and then it is returned to the environment.

In areas that do not have water treatment plants, Human waste can be placed in natural environments for cleaning and filtration. There is a town in Southern California that uses a swamp of water hyacinth flowers To completely, naturally recycle human waste.

70.8% of the surface is water, 29.2 % is land.

http://wiki.answers.com/Q/What_percentage_of_Earth%27s_surface_is_covered_by _water

Unless a planetary event happens, such as an asteroid hit or A resurgence of volcanism, the earth will not run dry.

Why don't you go to school and become a water scientist? There will be a great demand for them in the future. You can have fun doing what you like and you will have a job to raise a family.

Sincerest regards,
Mike Stewart


There is not an unlimited supply of water on the Earth. Most of the water, in fact, cannot be used for drinking. The majority of water on planet Earth is in the oceans and in the polar ice caps. That leaves about1 to 2 percent "fresh" water for farming, cooking, drinking, etc. And this water is not uniformly distributed around the globe. As the supply of "fresh" water dwindles armed conflicts are going to occur.

Vince Calder


The amount of water on Earth is limited. We could create more, but there are natural mechanisms that tend to keep the amount of water on Earth at a fixed amount.

Water molecules, or the elements that they are composed of (hydrogen and oxygen) are very slowly escaping from Earth's atmosphere to space, but so slowly that you do not have to be worried about it.

Theoretically, Earth will lose all of its atmosphere someday, perhaps billions of years from now, including all of the water in the atmosphere. At that point, without an atmosphere, Earth's surface will be much colder. However, some water will probably remain frozen in the soil and some will remain beneath the Earth's surface, just as apparently happened on Mars.

David R. Cook
Meteorologist
Climate Research Section
Environmental Science Division
Argonne National Laboratory



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