what is atmosphere?
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An atmosphere is an layer of gas or layer of gases that enveloped a planet, and is held in place by the gravity of the planetary body. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low.
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Answer:
An atmosphere is a layer of gas or layers of gases that envelope a planet, and is held in place by the gravity of the planetary body. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low.
Thesaurus
- What is another word for atmospheric?
atmospherical barometric al
meteorological barometric
weather weather-related
climatological meteorologic
air climatologic
Four layers
The atmosphere can be divided into layers based on its temperature, as shown in the figure below. These layers are the troposphere, the stratosphere, the mesosphere and the thermosphere. A further region, beginning about 500 km above the Earth's surface, is called the exosphere.
Thickness
about 300 miles
- Earth's atmosphere is about 300 miles (480 kilometers) thick, but most of it is within 10 miles (16 km) of the surface. Air pressure decreases with altitude.
Weight
about 5.5 quadrillion tons
- The total mass of Earth's atmosphere is about 5.5 quadrillion tons, or roughly one millionth of Earth's mass.
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