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Diagram of the five primary layers of the Earth's atmosphere (not to scale). From Earth's surface to top of stratosphere (50 km) is slightly less than1% of Earth's radius. Between troposphere & stratosphere is the tropopause.
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The troposphere is the lowest layer of the atmosphere. This extends from the planetary surface to the bottom of the stratosphere. The troposphere contains 75–80% of the mass of the atmosphere, [9] and is the atmospheric layer wherein the weather occurs; the height of the troposphere varies between 17 km at the equator and 7.0 km at the poles.
The Climate Prediction Center (CPC), including its name from 1978–1995, the Climate Analysis Center (CAC); The National Hurricane Center (NHC), including its name from 1950–1965, the Miami Hurricane Warning Office (HWO)
A 5 km (3.1 mi; 16,000 ft) deep sodium layer is located between 80–105 km (50–65 mi; 262,000–344,000 ft). Made of unbound, non-ionized atoms of sodium, the sodium layer radiates weakly to contribute to the airglow. The sodium has an average concentration of 400,000 atoms per cubic centimetre.
The troposphere is denser than all its overlying layers because a larger atmospheric weight sits on top of the troposphere and causes it to be most severely compressed. Fifty percent of the total mass of the atmosphere is located in the lower 5.6 km (3.5 mi; 18,000 ft) of the troposphere.
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