1. Chap 15, Sect 2 (Atmospheric Heating) Objectives: Please copy in your IAN! 1.Describe and show an example of conduction, convection, and radiation. 2.Explain the relationship between the greenhouse effect and global warming. 3.https://www.youtube.com/watch?v=I 6jIMkPwahQ https://www.youtube.com/watch?v=I 6jIMkPwahQhttps://www.youtube.com/watch?v=I 6jIMkPwahQ

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 1) Electromagnetic waves.

4. Weather Factors 2) 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. 3) Radiation: 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. 4) Conduction: 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. 5) 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.

9. 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 Put them all together: http://my.hrw.com/sh2/sh07_10/student/fla sh/visual_concepts/70523.htm http://my.hrw.com/sh2/sh07_10/student/fla sh/visual_concepts/70523.htm http://my.hrw.com/sh2/sh07_10/student/fla sh/visual_concepts/70523.htm

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

11. EactivityEactivity: How does this work in our atmosphere?

12. 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.

13. The Greenhouse Effect and Life on Earth As you have learned, about 70% of the radiation that enters Earth’s atmosphere is absorbed by clouds and by the Earth’s surface. This energy is converted into thermal energy that warms the planet. 6) The greenhouse effect: is Earth’s natural heating process. Increasing levels of greenhouse gases could cause global warming.

14. 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?

15. Bell Ringer: Please take out a copy of the 15.2 Thermal Energy Review Sheet from the blue tub. Spend 5 minutes checking yourself for understanding from yesterday’s lesson. Glue it in to your IAN when done, and title your next page, 2/24: Greenhouse vs. global warming

16. Weather Factors

17. Did you know? Because Venus is closer to the sun, it gets more thermal energy. Ordinary light can penetrate the atmosphere and hit it’s surface. The surface heats, just like our planet and radiates heat back into the atmosphere. Its surface becomes up to 460degrees C – hot enough to melt lead. This trapping of heat in the atmosphere is called the greenhouse effect.

18. Objectives: Discover/Illustrate what the greenhouse effect is, including how gases in Earth’s atmosphere act like a giant greenhouse to create the effect on a global scale. Research why the greenhouse effect is important to keeping us alive on Earth! Plus, see how the greenhouse effect relates to global warming, and do we need to prevent a global meltdown!

19. Greenhouse Effect Gases absorb the heat and act as a “blanket” to keep Earth warm. Some greenhouse gases: water, methane, carbon dioxide. The gases function like the glass walls and roof of a greenhouse, which allow solar energy to enter but prevent thermal energy from escaping.

20. http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/80 242.htm

21. Runaway Greenhouse Effect: Global Warming? Many scientists have become concerned about data that show that average global temperatures have increased in the past 100 years. Such an increase in average global temperatures is called 7) global warming. Some scientists have hypothesized that an increase of greenhouse gases in the atmosphere may be the cause of this warming trend. Greenhouse gases absorb thermal energy in the atmosphere = higher temps, not convection

22. Runaway Greenhouse Effect

23. 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 https://www3.epa.gov/ climatechange/kids/in dex.html https://www3.epa.gov/ climatechange/kids/in dex.html VS.

24. Global Warming Causes Natural: Volcanoes Solar flares Cycle Orbit Cows https://app.discoveryeducation.com/learn/videos/2E2EB 8C5-65C5-4825-BAE9- 4D5C2C283F43?hasLocalHost=false https://app.discoveryeducation.com/learn/videos/2E2EB 8C5-65C5-4825-BAE9- 4D5C2C283F43?hasLocalHost=false Forest fires Methane release in the arctic tundra

25. Manmade Causes: Industry Deforestation Cars Fossil fuels Wars Let’s Review! Heat/AC BrainPop GreenhouseBrainPop Greenhouse Arms race Nuclear waste Coal burning Electricity Land fills Acid rain

26. What’s Next? You Decide! Question: Is Global Warming real? Is it a natural event or man made? Is it natural and people are making it worse? Global Warming Brainpop Bill Nye debate Bill Nye debate

27. Define and Design Explain research on 2 different points of view for Global Warming. 5 facts each. Try to answer the following questions: A. What is it? B. What is causing it? C. What will change (ocean levels, animal/plant life)? D. What might the temperature be in 100 years? E. What is contributing to it? F. What are arguments for the ‘natural cycle’ side of it?

28. Links to inform your decision: http://earthobservatory.nasa.gov/Features/GlobalWarmin g/ http://news.bbc.co.uk/cbbcnews/hi/newsid_1570000/new sid_1575400/1575441.stm http://www.ncdc.noaa.gov/paleo/globalwarming/home.ht ml http://www.enwin.com/kids/conservation/global_warming.cfm http://www.kidcyber.com.au/topics/climatechange.HTM http://dnr.wi.gov/org/caer/ce/eek/earth/air/global.htm

29. Finish Argument: Persuasive Paragraph Your paragraph must include your opinion on each of the following: what G.W. is, share what side you take (Y/N) and why (research: facts to back up your side), and your conclusion on the argument. *You must include the sources that you used. Use sources that are based in Science not politics! There are scientists on both side of the issue. Due Friday, 2/26

30. Debate Format: You will be placed into groups of 4-6 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.

31. 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.