The Atmosphere The Atmosphere

Atmosphere: layers of GasesAtmosphere: layers of Gases

The earth is wrapped in layers of The earth is wrapped in layers of mixed gasesmixed gases

These gases reach 100km above the These gases reach 100km above the earth’s surfaceearth’s surface

The air we breath is a mixture of The air we breath is a mixture of gases (78% nitrogen, 21% Oxygen, gases (78% nitrogen, 21% Oxygen, remaining 1% is a combination of remaining 1% is a combination of argon, carbon dioxide and traces of argon, carbon dioxide and traces of helium, hydrogen and ozone)helium, hydrogen and ozone)

Atmosphere: a big blanket around Atmosphere: a big blanket around EarthEarth

The atmosphere reflects, absorbs, The atmosphere reflects, absorbs, radiates and transmits some of the radiates and transmits some of the sun’s energysun’s energy

Once the energy of the sun reaches Once the energy of the sun reaches the earths surface, the atmosphere the earths surface, the atmosphere traps much of it, warming the earthtraps much of it, warming the earth

Atmosphere: Protector Atmosphere: Protector

Some of the sun’s energy is dangerous Some of the sun’s energy is dangerous and can cause sunburns and skin cancerand can cause sunburns and skin cancer

Ozone (O3) in the atmosphere prevents Ozone (O3) in the atmosphere prevents most of the harmful energy to reach earthmost of the harmful energy to reach earth

In the 1970’s and 1990’s scientists found In the 1970’s and 1990’s scientists found that the ozone layer was thinning over that the ozone layer was thinning over Antarctica and the ArcticAntarctica and the Arctic

This was cause by the human use of CFC’sThis was cause by the human use of CFC’s

Is the Ozone layer recovering?Is the Ozone layer recovering?

Research the use of CFC’s and the Research the use of CFC’s and the Montreal ProtocolMontreal Protocol

Create a brochure of your findings Create a brochure of your findings

Ozone in the TroposphereOzone in the Troposphere Ozone has a toxic effect in the lower troposphere Ozone has a toxic effect in the lower troposphere

(where we live)(where we live) Ozone is produced when UV radiation from the Ozone is produced when UV radiation from the

sun combine with the exhaust from carssun combine with the exhaust from cars Ozone does not move from the troposphere into Ozone does not move from the troposphere into

the stratosphere, and causes damage to humans, the stratosphere, and causes damage to humans, plants, animals and buildingsplants, animals and buildings

How does the “Drive Clean” program by the How does the “Drive Clean” program by the Ontario Government help in preventing the Ontario Government help in preventing the production of ozone? production of ozone? www.ene.gov.on.ca/en/air/driveclean/www.ene.gov.on.ca/en/air/driveclean/