Oxygen in the atmosphere
Why is the oxygen concentration in the atmosphere constant? We think that our planet is provided with oxygen thanks to green pumps. In fact, this is not so. Of course, and trees vlyayutsya source of oxygen in the atmosphere. And they get oxygen oxygen in a complex way from water. Water during the day phase is split into its constituent oxygen and hydrogen. At the next stage hydrocarbons are formed with the use of carbon dioxide, and oxygen is released into the atmosphere.
But the constancy of oxygen is provided by underwater pumping activity. The cause of the eruption of volcanoes, is the internal heat of the earth.
Another interesting observation. If the amount of oxygen increases, this can cause permanent fires. Therefore our atmosphere does not consist of one oxygen but has nitrogen in its cell. And that someone will say that this is by accident. Or another observation. If carbon dioxide increases in the atmosphere, this will lead to warming. When the heat we know that the water is flowering - the amount of plankton increases. Plankton in its turn will bind carbon dioxide, turning it into chalk, than restore balas in the atmosphere.

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