how much water on earth?
441071
As you know, the Earth is a watery place. Estimates vary, but somewhere between 70 and 75 percent of the Earth's surface is water-covered. But water also exists in the air as water vapor and in the ground as soil moisture and in aquifers. Thanks to the water cycle (view a graphic of the water cycle) our planet's water supply is constantly moving from one place to another and from one form to another. Things would get pretty stale without the water cycle!\n\nWhen you take a look at the water around you, you see water in streams, rivers, and lakes. You see water sitting on the surface of the earth. Naturally, this water is known as "surface water." Your view of the water cycle might be that rainfall fills up the rivers and lakes. But, how would you account for the flow in rivers after weeks without rain? In fact, how would you account for the water flowing down this driveway on a day when it didn't rain? The answer is that there is more to our water supply than just surface water, there is also plenty of water beneath our feet.\n\nEven though you may only notice water on the Earth's surface, there is much more water stored in the ground than there is on the surface. In fact, some of the water you see \n\nThere is about 323 billion gallons  of surface water and about 85 billion gallons  of ground water.
412941
water-supply inflow rate which supply water to its end use points at the required flow rate and pressure.\n\nEach person uses about 63.75 gallon a day\n\nA average family of four uses 255 gallons of water indoors per day.\n\nMultipy that by a small city of about 50,000 people\n127,500,000 gallon per day
556217
It's the most important part of our earth. Just like our body.. 70% portion of water is in our body.
59626
The bigger problem is useable water.  Only 1% of earth's water can be used by humans.  The rest is salt water or glaciation.  Here's a good website explaining more:\n\nhttp://ga.water.usgs.gov/edu/earthwherewater.html
182560
The average depth of the oceans is about five times the average elevation of the land. In general, the continents stand about three miles above the ocean floor. According to the National Geographic Atlas, the deepest-known part of the ocean measures [10,924] meters (35,839 feet), in the Marianas Trench near Guam. If the world's highest mountain, Mount Everest (29,141 feet), were to be placed into this trench, it would be covered by over 1.25 miles of water.
470314
the specific gravity of water is 1.
67173
About 5 and a half litres, apparently - http://ask.yahoo.com/ask/20000612.html
796015
Liquid water occupies about 18 ml per mole, essentially irrespective of the pressure.  However, a gas at 0 C and normal pressure occupies 22.5 l, or 1250 times more volume.\nNow, you are asking for 1 psi, while normal atomospheric pressure is 14.7 psi, the volume of an ideal gas would be 14.7 times more, or in the case of the water, 18816 times the volume of the liquid water.  But there is a catch: the pressure of a gas (and therefore its volume if on tries to keep pressure constant) increases with temperature.  The 18816 figure thus applies only to water vapor at 1 psi and at 0 C (32 F).
1129982
Just a guess, but, maybe a tenth of a centimeter? The Earth is constatly being bombarded by ice crystals from space, that increase our water volume on Earth. So, we might NEED to remove all the sponges from the  Deep, in another million years or so.
391671
Well, try to estimate ...\n\nCertainly, much-much-much-much less than even 2 to 549th power ... of course you cannot count, but you can make a very rough estimate.\n\nThe radius of Earth is roughly 6000-7000 km, so its surface area is ~ 10^8 km^2 = 10^16 cm^2\n\nNow go out in your back yard and count the average number of grass blades/cm^2 ... let's say you get 1/cm^2\n\nAs not all of the Earth is covered with grass, its unlikely that there are much more blades than 10^16. So 12900459358983340354 is definitely WRONG. But it's also unlikely that there are less than 10^13. Now I know that 10^16 is 1000 times greater than 10^13, but even with such rough estimates, we do know more than before doing these calculations, don't we?
449917
Water Systems:\n\nhttp://www.ec.gc.ca/water/images/nature/prop/a2f2e.jpg\n\n95% of Earth's water is Salt Water leaving 5% as Fresh Water.  Nearly all of the Fresh water is in the form of Ice or underground.\n\nThis site appears to have a lot of data as well as activities for learning.\n\nhttp://members.aol.com/bowermanb/water.html
308409
Good question and I am the right one to answer it for you.\n\nBy definition\nan iota = 1 molecule\nweight of one molecule of water = 18 moles. (1 mole of H2O = 6.023 X 10^23 molecules of H2O = 18 grams H2O) \nso, we can establish\nan iota of water = 18 grams (1kg of water = 1 litre of water)\n\nA gallon of water in US = 3.785 litres\nA gallon of water in UK = 4.546 litres\nTherefore 5 gallons would contain 1051.38888888888889*6.023* 10^23 iotas in the US\nand in the UK 5 gallons would contain 5051.1111111111111*6.023*10^23 iotas.\nHope your problem is solved.
155525
air,fire, water and earth
313516
you can check the hydrology subject, precipetation infiltrate the earth, run off on the surface and evaporate, count the usage of water of every individual multiply by population plus waste you can get the answer
704875
What would have happened had all of the existent water in the atmosphere fallen during those forty days and forty nights? \n\nCalculations indicate that there is approximately 0.013 x 1015 m3 of water in the planet's atmosphere. This corresponds to approximately 13 x 1018cm3 of water. Now the questions looks like this: What would have happened if, during forty days and forty nights, 13 x 1018cm3 of water had fallen in the form of rain?\n\nTo answer this question, we need to know the surface area of the planet. It is approximately 510,067,000 km2. This corresponds to approximately 51 x 1017 cm2. If we imagine that the surface of the earth is completely smooth and that the oceans, seas, rivers, and streams are at the same level as the earth, then the water would reach a height that is provided by a simple equation, namely: \n\nV = A x h where V is volume, A is area and h is height. To obtain the height, the equation is as follows: h = V/A\n\nBy substituting V with the volume of existent water in the atmosphere and A with the surface area of the planet, we have: \n\nh = 13 x 1018cm3/51 x 1017 cm2 = 2.55 cm\n\nTherefore, if all of the existent water in the atmosphere were to fall upon the earth, independent of the amount of time it rained, the maximum height attained would be 2.55 centimeters, according to available data. We have now offered the first disagreement between the Bible and our current knowledge with respect to the deluge.
956323
how much do you drink???
61329
321,000,000 cubic miles of water in the oceans! That is 96.5% of the water on the Earth...\n\nKeep in mind that a cubic mile is a little bit over a TRILLION gallons! Mind boggling, isn't it?