How is the amount of water on earth kept constant?
Answer:
Water is broken down for various compounds through natural activities. It binds with CO2 to form acid rain and iron pulls the oxygen out of water to make rust. Also, oxygen and hydrogen don't spontaneously react; they need a spark or fire or something to cause it to happen.
Things are really more stable than we think sometimes.
Temperature, Geography, global Warming...Water can't escape into the universe so H2O will always remain constant.
The water cycle keeps the water levels in perfect balance.
Atmospheric pressure prevents the sun from blasting the water off the planet and from evaporating into space.
Amount as rain/precipitation = amount evaporated.
An example of a closed system equilibria.
I don't get your point... hydrogen and oxygen are constant so the earth should flood or dry up?
If you're asking why the hydrogen and oxygen stay in water form, it's becasue that minimises it's free energy. All systems tend to do this if left to themselves.
The water cycle has also been explained above, so that's that covered!
not sure wxactly what your asking here, but water is not destroyed or created in nature, it just changes physical states, thats how it is recycled. the amount of water on earth in any state, liquid, gas, or solid is fairly constant. Water can be created or detroyed in the lab with a process called electrolosis using electricity.
The Earth is a closed system.
Gravity prevents the escape of matter unless it is projected at a velocity greater than the escape velocity (FAST)
So all the concentration of atoms on Earth is constant.
Where these atoms are distributed (as molecules) varies.
The water cycle continues to replace the Sea and rivers from waste material and precipitation.
Decomposition of water to its elements is on a very small scale (globally) so the % ddifference is virtually unmeasurable (VERY small fraction of a %)
If hydrogen is used as a fuel, the combustion to water replenishes what was lost by the decomposition to hydrogen and oxygen.
The amount of Hydrogen (of which there is little) and Oxygen in the atmosphere has no bearing on the amount of water in and on the Earth.
The water we have today is the same water that's been on Earth since the Earth formed.
Only its distribution and usage changes. Flooding here, drought there, changing cloud and ice formations, humidity of the atmosphere...etc..are always changing but the amount of water never changes.
It's called the Earth's 'Water Cycle' or the 'Hydrologic Cycle'.
Its description: -
*...The amount of water on and in the earth is constant, only its distribution around the earth varies.
*...The water of the earth is constantly evaporating and the 'Transpiration' of water vapour from the vegetation is also taking place.
Water vapour from the combustion of fossil fuels, the vapour from large, industrial cooling towers is also entering the atmosphere.
*...All of this evaporation from the vegetation, seas, oceans, lakes and rivers is sending this water vapour into the atmosphere.
*...As the water vapour rises, it cools and condensation begins to take place and, at the right conditions of atmospheric pressure and temperature, the coalescing droplets of water become big enough to form raindrops, or snow, or hail.
This falls back to earth onto the land, the rivers, the oceans and lakes and, the water run-off from the land and sub-surface areas finds it way back into these accumulations (or bodies of water) from where the whole cycle begins again.
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