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The Earth has an atmosphere rich in oxygen, moderate temperatures, abundant water and a varied chemical composition.
It is recommended to visit the chapter on the atmosphere for more detail.
The intense terrestrial gravity acted as an invisible barrier that retained and prevented much of the charged particles that spilled into space from escaping as a result of the different chemical reactions that occurred on the surface and interior of our planet.
In this way the complex Earth atmosphere was formed. This layer of air has been fundamental for life to develop in its different forms, but also to preserve the planet's surface. In this way the earth's crust was generated, constituted by the alteration of the igneous rocks of the mantle as a result of the action of the atmospheric agents on the rocky strata exposed to the inclement weather.
In the early days of our planet, the volcanic activity was so intense that, as a result of its emissions, a gas layer was generated. This gas contained a multitude of charged particles, interacting with each other and punishing the newly solidified Earth's surface in the form of lightning or electric shock.
This layer is called "atmosphere I" by scientists. It had a very different composition from the present one, but it had a vital importance since it allowed the formation of liquid water, as well as the presence of water vapor that, when cooling and falling in the form of rain, formed the hydrosphere.
The continuous exchange of elements between the three layers, atmosphere, hydrosphere and lithosphere or geosphere, is vital for the processes of life, especially the carbon and oxygen cycles. More than 90% of current living beings use carbon as a vital element of their structures.
Of the thousand kilometers that the current atmosphere is high, only the 10-18 km closest to the crust have enough water vapor and dust in suspension to be visible to the human eye. So, after 18 km, where the troposphere ends, the dark space begins. However, the northern lights usually appear at heights close to one thousand kilometers, where electrically charged particles in our atmosphere interact with solar particle radiation.
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