Chapter 22 Section 1 Chapter 22 Section 1 Review Page 554 (1-4)Review Page 554 (1-4)

1. 1. Describe the Describe the composition of dry air composition of dry air at sea level.at sea level.

• Nitrogen = 78%Nitrogen = 78%

• Oxygen = 21%Oxygen = 21%

• Argon = 0.9%Argon = 0.9%

• Other gases (like COOther gases (like CO2 2 < 0.1% < 0.1%

Gases in the AtmosphereGases in the Atmosphere

2. 2. Identify five main Identify five main components of the components of the atmosphere.atmosphere.

• NitrogenNitrogen• OxygenOxygen• Water VaporWater Vapor• OzoneOzone• ParticulatesParticulates

ParticulatesParticulates

3. 3. Explain the cause of Explain the cause of atmospheric pressure.atmospheric pressure.

• Atmospheric pressure is caused Atmospheric pressure is caused by the weight of atmospheric by the weight of atmospheric gases as a result of gravity gases as a result of gravity pulling the gas molecules toward pulling the gas molecules toward Earth.Earth.

Atmospheric PressureAtmospheric Pressure

Mercury BarometerMercury Barometer

Aneroid BarometerAneroid Barometer

4. 4. Identify the layer of Identify the layer of the atmosphere in the atmosphere in which weather occurs.which weather occurs.

• Weather happens in the Weather happens in the troposphere.troposphere.

Weather Weather in the in the

TropospherTropospheree

The End…..The End…..