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| Changes in Earth's atmosphere |
Changes in Earth's atmosphere over geological time
Water vapor, sulfur from the earth's atmosphere through a process called degassing and various gases including oxides of nitrogen came out and formed the original atmosphere. Later, with the arrival of photosynthetic cyanobacteria, the oxygen in the atmosphere increased with the increase in vegetation. After the ozone layer is formed, it absorbs the sun's harmful ultraviolet rays and starts protecting the earth's surface from its effects. As the surface of the earth became more suitable and safe for life, the number of species also increased. It should be noted that as a result of the ozone layer, apart from the sea, various species of life begin to roam and develop on land. The source of Earth's water is mainly identified with comets that hit Earth in its early stages. However, by examining the rocks obtained from deep in the earth's surface, it has been found that water is associated with the molten rock under special conditions of high temperature and pressure in the Earth's mantle, which is much more than the water found on the surface.
