The gases have many different compositions depending on the altitude in this layer.

The transfer of energy by waves through air or empty space.

The most abundant gas in the atmosphere.

The pressure exerted by the atmosphere on all objects within it.

The lowest layer, which contains almost all of the Earth's water vapor (this is where most weather takes place.)

The transfer of heat energy from molecule to molecule by contact.

The two gases are necessary for life on earth.

The force (weight) is applied over a unit of area.

The uppermost limit of the homosphere and the air is very thin, in fact, most meteoroids burn up here.

The transfer of heat energy, through a liquid or gas, by currents.

This gas is needed for living things to perform life functions.

The process by which certain gases (principally water vapor, carbon dioxide, and methane) trap heat that radiates from Earth.

The mass of air surrounding a planet.

Energy that is transferred as a consequence of temperature differences.

This gas is needed by plants to produce food through photosynthesis.

The major layers from Earth's surface outward.

The mixture of gases in the air is the same throughout this layer.

A measure of the energy of random motion in a substance's molecules.

These gases absorb the infrared light the Earth radiates back into space and heats up the atmosphere, regulating the Earth's temperature.

Protects life on Earth from bombardment by meteors and high-energy radiation from space, it also filters out much of the harmful ultraviolet radiation before it can reach Earth's surface.