review chem

layer of gases that surrounds the planet

• atmosphere

• troposphere

• mesosphere

• stratosphere

atmosphere's functions

• covering the Earth

• protecting the Earth from meteors

• absorbing heat

• protecting from solar ultraviolet radiation

• providing us with oxygen

composition of air is

• 78% oxygen

• 78% nitrogen

• 21% oxygen

• 21% nitrogen

• 1% CO2, water vapor, and argon

lowest layer of Earth's atmosphere

• troposphere

• mesosphere

• stratosphere

• exosphere

It extends from Earth's surface to anaverage height of 12 km.

• troposphere

• exosphere

• mesosphere

• atmosphere

its composition is the same as air

• troposphere

• mesosphere

• stratosphere

• exosphere

Temperature usually declines with increasing altitude, It varies from 18ºC at the surface to -60ºC at the top.

• troposphere

• mesosphere

• thermosphere

• atmosphere

Earth's weather takes place here

• troposphere

• mesosphere

• atmosphere

• thermosphere

Conventional aviationoccurs here, it’s the only layer accessed by propeller airplanes, helicopters, aerostatic balloons

• troposphere

• mesosphere

• exosphere

• thermosphere

second-lowest layer of Earth's atmosphere

• stratosphere

• mesosphere

• thermosphere

• exosphere