Chapter 10, Section 2 Chapter 22, Section 1

The Atmosphere Key Terms: Create a flashcard for each. The words can be found starting on page 547 or use the glossary. If you finish early, study your new words! Atmosphere Ozone Atmospheric pressure Troposphere Stratosphere Mesosphere Thermosphere

Composition of the Atmosphere Nitrogen makes up about 78% of the Earth’s atmosphere. Nitrogen Cycle: N moves from air to soil then to plants and animals and back to the air Oxygen makes up 21% Plants produce O during photosynthesis

Ozone Ozone is a molecule of 3 Oxygen atoms Ozone forms the Ozone layer in the upper atmosphere Ozone absorbs harmful UV rays Some human activities break down ozone and the layer (CFCs, exhaust)

Atmospheric Pressure Gravity holds the gases of the atmosphere near the surface. The air molecules are compressed and exert force of the Earth’s surface= ATMOSPHERIC PRESSURE Atmospheric Pressure changes at different altitudes and temperatures

INTERACTIVE Draw a diagram of the Egg Demo, label and explain in your own words what happened.

Measuring Atmospheric Pressure Meteorologists use ATMOSPHERES (atms) to measure air pressure. The average atmospheric pressure at sea level is 1 atm A barometer is the instrument to measure atms

Layers of the Atmosphere Troposphere: layer that is closest to the earth’s surface and where most weather occurs. Stratosphere: top of the troposphere to about 50km. Most of the Ozone is in the troposphere Mesosphere: above the stratosphere to 80km, nearly - 90 degrees Celsius. Coldest layer. Thermosphere: Above mesosphere, temperature increases because of solar radiation. Ionosphere: lower part of thermosphere, where AURORAS occur---Interactions between solar radiation and the gases of the ionosphere.

Temperature Inversions The layering of warm air on top of cool air is a TEMPERATURE INVERSION. This can trap the cool air. If the cool air is polluted= SMOG

Temperature Inversion Clips Water Demo Clip

INTERACTIVE

Brain Pop Atmosphere

INTERACTIVE/ASSESSMENT In groups: Create a poster for an assigned section of text Must include diagrams/illustrations (labeled) and a summary Composition of the Atmosphere Ozone Atmospheric Pressure Measuring Atmospheric Pressure Layers of the Atmosphere Auroras Temperature Inversions