1. Chap 15, Sect 2 (Atmospheric Heating) Objectives: Please copy in your IAN! 1.Describe and show an example of conduction, convection, and radiation. (glue and paste from blue tub) 2. Explain the relationship between the greenhouse effect and global warming.

2. 15.2 Atmospheric Heating You are lying in a park with your eyes closed, and you feel the warmth of the sun on your face. Did you ever realize that it takes a little more than 8 minutes for the energy to travel to your face from a star 149,000,000 km away?

3. Weather Factors Sun’s energy travels to earth as Electromagnetic waves.

4. Weather Factors Scattering: Reflections of light in all directions. Why is the sky blue? (videoclip) http://app.discoveryeducation.com/player/v iew/assetGuid/6BFFC6FF-2E83-41D6- 9B51-1653D5BE0386 http://app.discoveryeducation.com/player/v iew/assetGuid/6BFFC6FF-2E83-41D6- 9B51-1653D5BE0386 http://app.discoveryeducation.com/player/v iew/assetGuid/6BFFC6FF-2E83-41D6- 9B51-1653D5BE0386

5. Radiation Ever feel the heat of the sun on your face or the heat from standing by a campfire? That is radiation. It is the direct transfer of energy by electromagnetic waves.

6. Conduction Have you walked barefoot on the sand at the beach and the sand burned your feet? That is conduction. It is the direct contact/ transfer of heat from one substance to another.

7. Convection Have you ever come inside with wet shoes on and your mother told you to put them over the heating vent to dry? How does this dry them even though the actual furnace is in the attic? That is convection. The transfer of heat by the movement of fluid or air. Hot air rises, cold air sinks. Basement colder than upstairs Transfer of energy by circulation.

8. Examples Cooking on the stove-pot on burner Hot air balloon rising Fireplace warming a room Curling iron on hair Blow dryer on hair Air from furnace heating the house

10. Bonfire Example Radiation keeps you away. Smoke and flame are carried away by convection. Ground beneath the fire gets hot by conduction.

11. How is Earth heated? Light/heat from the sun RADIATES through the atmosphere, hits the Earth where it is absorbed. This heats the air above it by CONDUCTION. This heat rises up to the greenhouse gases where it is trapped, cools, sinks and heats at the surface again.- CONVECTION. Think about it: Why does 70 degrees in Spring feel colder than 70 degrees in Fall?

12. Weather Factors

13. In Summary: Energy from the sun is the driving force behind the water cycle, which contributes to create Earth’s weather. Radiation is transfer by electromagnetic waves. Thermal conduction is energy transfer by direct contact. Convection is energy transfer by circulation. The greenhouse effect is Earth’s natural heating process. Increasing levels of greenhouse gases could cause global warming.

14. Greenhouse Effect These gases absorb the heat and act as a “blanket” to keep Earth warm. Some greenhouse gases: water, methane, carbon dioxide.

15. Runaway Greenhouse Effect

16. http://www.epa.gov/climatechange/kids/ind ex.html http://www.epa.gov/climatechange/kids/ind ex.html http://www.bing.com/videos/search?q=bill+ nye+global+warming&qs=n&form=QBVR& pq=bill+nye+global+warming&sc=8- 23&sp=- 1&sk=#view=detail&mid=B709AB17CAFE 760B2441B709AB17CAFE760B2441 http://www.bing.com/videos/search?q=bill+ nye+global+warming&qs=n&form=QBVR& pq=bill+nye+global+warming&sc=8- 23&sp=- 1&sk=#view=detail&mid=B709AB17CAFE 760B2441B709AB17CAFE760B2441

17. The Greenhouse Effect The Greenhouse Effect Global Warming  gases (CO 2 and water vapor) absorb water vapor) absorb thermal energy and thermal energy and radiate it back to radiate it back to Earth Earth  a process that reminds us of an reminds us of an actual greenhouse actual greenhouse  an increase in average global average global temperatures temperatures  an increase in greenhouse gases greenhouse gases in the atmosphere in the atmosphere VS.

18. Global Warming Causes Natural: Volcanoes Solar flares Flatulence Cycle Orbit Snow Poop Cows Forest fires Methane release in the arctic tundra

19. Manmade Causes: Industry Deforestation Cars Fossil fuels Hairspray Wars Blow dryers Heat/AC Hot water Arms race Nuclear waste Coal burning Electricity Land fills Acid rain

20. Define and Design Explain 2 different points of view for the Greenhouse Effect. Due =1/16 & 1/18 This is a lab grade: 4 labs = 30% Other upcoming dates? –Ch. 15 Quist 1 = 2/24 –Ch.16/17 Quest 2 = 3/6 –Tech Term Final = 4/2

21. Debate Format: You will be placed into groups of 4 to compare notes and information. You will then be told which side you are arguing. The floor will be opened for speaking 1 at a time. You may “respectfully disagree” with each other once the speaker has finished. Remember, if you get really loud, it is a sign of weakness.

22. Debate Tips: Be polite and courteous. Listen attentively Be respectful and supportive of peers. Avoid inappropriate noises. Speak only when recognized by the moderator. Allow others to express their opinions; do not monopolize the debate. Use grammatically correct language. Speak clearly, slowly, and loud enough to be heard by the audience. Speak with passion and excitement.