What is the nitrogen cycle? Detailed answer

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What is the nitrogen cycle? Detailed answer

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What is the nitrogen cycle?

All life on earth requires nitrogen in a usable form. It is just as important for plants and animals as it is for humans. Nitrogen is a component of protein, which is a building material for the human body. Without this substance, no one would be able to grow or repair damaged tissue.

While oxygen makes up 21% of the air we breathe, it contains 78% nitrogen. Over one square kilometer of the earth's surface is approximately 7 tons of nitrogen. It is a colorless, odorless, tasteless gas that is slightly soluble in water. It may seem that since nitrogen is everywhere in the surrounding air, it is very easy for a living being to obtain it. But man cannot consume pure nitrogen. When inhaled, it absorbs oxygen. Therefore, nitrogen is useful only when, in combination with other substances, it forms compounds.

In nature, there are only a few plants that can absorb pure nitrogen from the air. These include legumes: beans, peas and clover. But all plants are able to use simple nitrogen compounds from the soil in which they grow. Therefore, in nature, there is a nitrogen cycle that allows you to support the life of plants and animals. Plants take simple nitrogen compounds from the soil and combine them with carbon to make protein. Animals get nitrogen by eating plants.

Nitrogen returns to the earth in the waste guide. Certain bacteria convert these wastes back into simple nitrogen compounds, and plants can use them again. Thus the cycle ends. Nitrogen reserves are also replenished by bacteria, which take nitrogen from the air and accumulate it in the soil.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What are brown dwarfs?

According to modern theoretical concepts, only objects with a mass exceeding the mass of Jupiter by 80 or more times become real stars. Objects with a mass less than 17 Jupiter masses are destined to become planets.

Brown dwarfs are objects with an intermediate mass between the two types described above. They are too large to be considered planets, but not large enough for thermonuclear reactions characteristic of stars to occur inside them (thermonuclear reactions can occur in their depths only with the most "light-burning" isotopes).

The existence of these barely warm, and therefore dark and difficult to distinguish objects, has only recently been experimentally proven (with the help of the Hubble Space Telescope).

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