This results in a slow but steady Because unfixed has a low molecular weight, it can achieve more readily and it leaks into outer space at a greater rate than other gasses. The leakage of hydrogen into space contributes to the pushing of the Earth from an initially state to its current one. Photosynthesis provided a source of free oxygen, but the loss of reducing agents such as hydrogen is believed to have been a necessary precondition for the widespread accumulation of oxygen in the atmosphere. Hence the ability of hydrogen to escape from the Earth's atmosphere may have influenced the nature of life that developed on the planet In the current, oxygen-rich atmosphere most hydrogen is converted into water before it has an opportunity to escape. Instead, most of the hydrogen loss comes from the destruction of in the upper atmosphere.
Above the troposphere, the atmosphere is usually divided into the, and Each layer has a different defining the rate of change in temperature with height. Beyond these, the thins out into the, where the Earth's magnetic fields interact with the Within the stratosphere is the ozone layer, a component that partially shields the surface from ultraviolet light and thus is important for life on Earth. The, defined as 100 km above the Earth's surface, is a working definition for the boundary between atmosphere and space
Thermal energy causes some of the molecules at the outer edge of the Earth's atmosphere have their velocity increased to the point where they ca from the planet's gravity. This results in a slow but steady Because unfixed has a low molecular weight, it can achieve more readily and it leaks into outer space at a greater rate than other gasses.
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