water balance means __the data regarding to  water flow like what ammount from sky every year and what is the final disposal
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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
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it's usually filled with deionized H2O, used of course for washings (filtrate, precipitate, etc) or adding water to ur reaction system
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let me give a example\nlet said the world is like a glass filled with water.\nthen someone add more water into the glass which cause the water to overflown .it mean glass full of water mean the amount of people lived inside the world , when people is born they are bought into this world destroying the balance causing the water to overflown but the water that pour is still inside.we die to maintain the balance of the world or else the world will be overflown with people.\n\nwe live to enjoy the time given to us and to mark the our living or our name
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If you don't, some of the water will evaporate into the air, so it will seem like you "lost" some water.
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A. Condensation. One might say D. but this would be wrong because the vapour has first to condense into tiny droplets (in clouds) which then clump together to form rain or snow (precipitation).\n\nNote that the other answers are 'blinds'. Nitrogen fixation has nothing to do with the water cycle. Recycling refers to re-using waste material. They are put there to test whether you know absolutely nothing, have heard some words about it, understand a little or have a good grasp of the subject.\n\nIf the question were marked out of 2, I would give 2 marks to A., 1 mark to D., maybe half a mark to C. if I felt the rest of the answers in the paper showed promise and no marks to B.\n\nWhen you are doing tests, it very often helps to ask, "Why are they asking this question?", "What piece of knowledge are they testing?" and "Why these particular options?"
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water, drinkable water. territorial access to ports and water. \n\none day certain water may get so contiminated the ecosystem will not be able to purify the water. then ground water will become very valuable.
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It's the actual temperature with humidity, wind chill factor (if applicable), dew point and other conditions taken into consideration. There's actually a mathematical equation to figure it out but it may be hard to find since the calculations are done by computers these days.
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During winter the water at the surface of lake or pond gets cooled.\n\nDue to cooling density of water increases; denser water\ngoes down, while the relatively hot water comes up. This is convection.\n\nBut water has a peculiar property that below 4 degree C it becomes less dense.\n\nTherefore when the surface temperature is 4degree and below, the water at the surface cannot go down. Hence convection of water is stopped. \n\nThe temperature increases relative to water surface.  If the temperature of the water surface reaches freezing temperature, ice is formed on the surface and the freezing takes place from top to bottom.\n\nThus lives of water living creatures are saved from freezing.
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airborne:  mist, fog, steam, rain\nFresh water: lake, stream, creek, pond
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Usually this is measured in grams of salt per liter of water. The greater the grams the greater the salinity.\n\nWith salt dissolved in the water (salt being a solid) the water is more dense (in a sense {loose sense}) salt filled the spaces between the water molecules, making an equal amount of salt water heavier than the same amount of water.\n\nGet an "A".
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It REALLY isnt that big of a deal.  It isnt like oil that when it;s gone, it;s gone forever.  Water is contantly recycled, and the second it goes down the drain, it goes to the water place, gets cleaned, and it drunk/bathed in/peed in by someone else.\n\nThe water you drink from your kitchen was once in someone's toilet.\n\nWe will NEVER run out of water.  Period.
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absorbed, reflected and used (IE: converted to energy)
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Water towers store water at an elevated height to provide sufficient water pressure (from gravity) in the water system.  The water gets in to the tower via pumping.  If you need to know more, see:\n\nhttp://en.wikipedia.org/wiki/Water_tower
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Collecting gas over water is a coming chemistry method, because it assures that the gas produced is pure, with air.\nFill a large bassin with water, take a beaker, put it in the water, so that it is filled completely. Next lift the beaker upward and upside down. Don't take it out completely. The water will stay in the beaker.\n\nIf you know lead a tube from the experiment where the gas is produced under the beaker, the gas will replace the water. You are "collecting gas over water".
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This might be useful:\n\nhttp://en.wikipedia.org/wiki/Evaporation
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Use Archimedes's buoyancy principal.  The weight outside represents the response of mass to the Earth's gravity.  The weight in water represents the displaced water's weight.  Use the ratio to get the answer.  HINT: if you convert to mass, the answer almost gives itself away.\nThe displaced water has a well known density.  That density will give the volume of the both the displaced water and the object displacing it.
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Wikipedia: Water \nWater (in its pure form) is a tasteless, odorless substance that is essential to ... See Water (disambiguation) for other meanings. ...\nQuick Links: Etymology - Chemical and physical properties - Color\nen.wikipedia.org/wiki/Water - 145k - Cached - More from this site \nWater Science for Schools (USGS): All about water! \nWater Science for Schools (USGS): All about water! Water Science for Schools (USGS): All about water! All about water - the U.S. Geological Survey's Water Science ...\nCategory: Hydrology\nga.water.usgs.gov/edu