1. Objective 11: I can define ozone layer and greenhouse effect
Ozone layer: a layer of O3 in the stratosphere, it absorbs ultraviolet rays, which stops them from reaching the surface of the earth
Greenhouse effect: the process by which heat is trapped in the atmosphere by water vapor, carbon dioxide, methane and other gases that form a “Blanket” around the Earth.

2. Objective 12: I can describe how altitude affects air pressure and temperature
Altitude: used to describe the height of something in relation to sea level on Earth.
Altitude and Air Pressure: Altitude , Air Pressure
Altitude and Temperature:
Troposphere - Altitude , Temperature
Stratosphere – Altitude , Temperature
Mesosphere – Altitude , Temperature
Thermosphere – Altitude , Temperature

3. Objective 13: I can explain the composition of air
Air is mainly made up of:
78% NITROGEN
21% OXYGEN (O2)
1% Other gases – mainly water vapor (H2O), and Carbon Dioxide (CO2) and other trace gases

4. Water vapor and Carbon Dioxide

5. Composition of the Atmosphere
Remember:
Composition of the Atmosphere
“Never (Nitrogen)
Open (Oxygen)
Canned (Carbon Dioxide)
Worms” (Water Vapor)

6. AIR MOLECULES

7. It is a thin layer of gases surrounding the earth
The Atmosphere
It is a thin layer of gases surrounding the earth
Gases include Nitrogen, Oxygen, Water Vapor, Carbon Dioxide and others.
Particles are also a part of the atmosphere
It is ESSENTIAL to our survival and life on earth