Earth's Atmosphere

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Submitted By cryptic02
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Earth's atmosphere is a unique reservoir of gases, the product of nearly 5 billion years of development. It sustains us and protects us from hostile radiation and particles from the Sun and beyond-the atmosphere serves as an efficient filter.When astronauts work in space, they must wear a bulky spacesuit that does everything to sustain and protect them that the atmosphere does for us all the time.Atmosphere is a gaseous mixture of ancient origin, the sum of all the exhalations and inhalations of life on Earth throughout time.
The principal substance of this atmosphere is air, the medium of life as well as a major industrial and chemical raw material. Air is a simple mixture of gases that is naturally odorless, colorless, tasteless, and formless, blended so thoroughly that it behaves as if it were a single gas
ATMOSPHERIC PROFILE: We consider the top of our atmosphere to be around 480 km (300 mi) above Earth's surface, the same altitude we use for measuring the solar constant and insolation receipt. Beyond that altitude, the atmosphere is rarefied (nearly a vacuum) and is called the exosphere, which means "outer sphere." It contains scarce lightweight hydrogen and helium atoms, weakly bound by gravity as far as 32,000 km (20,000 mi) from Earth.Earth's modern atmosphere is in a series of imperfectly shaped concentric "shells" or "spheres" that grade into one another, all bound to the planet by gravity.As critical as the atmosphere is to us, it represents only the thinnest envelope, amounting to less than one-millionth of Earth's total mass.
We study the atmosphere by viewing it in layers that have distinctive properties and purposes.We simplify this complexity by using three atmospheric criteria: composition, temperature, and function. * Earth's atmosphere exerts its weight, pressing downward under the pull of gravity. Air molecules create…...

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