The Atmosphere

the state of the atmosphere at a given time and place weather: the state of the atmosphere at a given time and place depends on: amount of clouds •temperature air pressure •wind amount of moisture - precipitation

A thick blanket of gases surrounding the Earth atmosphere A thick blanket of gases surrounding the Earth composed of AIR (a mixture of gases)

Observe a visual model of Earth's spheres.

What gases are in air? Nitrogen (N) 78% Oxygen (O) 21% Also, Carbon Dioxide (CO2), H2O Vapor, and Argon (Ar) in small amounts

Earth’s Atmosphere from Space

Troposphere:layer of the atmosphere closest to the Earth where weather happens Stratosphere: second layer of the atmosphere where the ozone layer is where airplanes fly

Mesosphere: third layer of the atmosphere where meteors burn up Thermosphere: outmost layer of the atmosphere where auroras happen

3 oxygen atoms bonded together ozone: O is an atom of Oxygen (O) O2 is atmospheric Oxygen (O-O) O3 is ozone (O-O-O)

Absorbs 99% of harmful ultraviolet rays from the sun ozone layer is about 10 to 20 km thick thinning is the result of chloroflorocarbons (CFC’s) containing chlorine, fluorine, and carbon

This shows a hole in the ozone

Almost all of the Earth’s energy comes from the sun and is called radiant energy most reaches the atmosphere and is reflected back to space

As much energy leaves the Earth that comes in ---> Earth’s heat is balanced. greenhouse effect: trapping of the sun’s energy by the Earth

caused by the burning of fossil fuels- coal, oil, and natural gas- adds CO2 into air warming effect may melt glaciers and raise sea levels