1. Seasons  Catalyst  What is the redshift, and how does it provide evidence for the Big Bang?  What is the difference between the heliocentric and geocentric model?  Venus is one planet closer to the Sun than the Earth. What can we conclude about the length of Venus’ year, compared to the Earth’s? Write in complete sentences! Don’t talk during the Catalyst!

2. Objectives By the end of today, all SWBAT…  State that the Earth’s axis is tilted  Describe the difference in intensity between direct and indirect sunlight  Explain how the tilt of the Earth’s axis produces seasons

3. Agenda  Stand up and pair up  Notes:  Earth’s basics  Tilt  Direct and indirect light  Seasons  Classwork: Images and Critical Questions  Bingo  Homework????

4. Stand Up Pair Up  Find a person with the matching color piece of paper  Read the question with your partner and discuss the answer  Prepare to share answers with the class

5. Review: Earth’s Basics

6. Earth and Sun  Key Point #1: The Earth revolves AND rotates counterclockwise around the Sun  As we already know, the heliocentric model states that the Earth revolves around the Sun

7. Earth is divided into Hemispheres

8. Latitude  Latitude = Imaginary horizontal lines that run East-West around the globe

9.  Take a look at the earth’s orbit again.  What do you notice?  http://www.classzone.com/books/ea rth_science/terc/content/visualizatio ns/es0408/es0408page01.cfm?cha pter_no=04 http://www.classzone.com/books/ea rth_science/terc/content/visualizatio ns/es0408/es0408page01.cfm?cha pter_no=04

10. Tilt of the Earth  Key Point #2:  The tilt of the Earth causes different parts of the Earth receive sunlight of different intensity  The Earth is tilted 23.5º degrees

11. Flashlight Demo  Look at the flashlight beam when it is shined directly over the paper and look at the beam when it is shined at an angle.  Which beam is more intense?

12. Direct and Indirect Light  Direct light: light that hits the earth “straight on” --Concentrated, strong  Indirect light: light that hits the earth at an angle --Spread out, weaker

13. You try: NORTHERN Hemisphere… Direct or indirect? Hot or Cold?

14. You try: SOUTHERN Hemisphere… Direct or indirect? Hot or Cold?

15. Key Point #3: The tilt of the Earth’s axis causes there to be seasons  Hemisphere TOWARD Sun = SUMMER  Hemisphere AWAY from Sun = WINTER

16. Season N: ________________ Season S: ________________ ˘ Season N: ________________ Season S: ________________ ˘ Season N: ________________ Season S: ________________ ˘ Season N: ________________ Season S: ________________ ˘

18. What season in the Northern Hemisphere??? Summer

19. Think about this…  Why is the North Pole always experiencing winter? The North Pole is always cold because it always receives indirect rays that are less intense.

20. Stations… Work on the Classwork with your group mates  Team points for those working together!

21. What is wrong???? A. B.B. C.C. D.D. Summer Winter

22. Bingo Vocab  Direct  Indirect  0  latitude  90  latitude  Summer  Winter  Concentrated  Toward  Away

23. Bingo  This place always receives direct sunlight

24. Bingo Vocab When the Northern Hemisphere is tilted away from the sun, the season is…

25. Bingo  When the earth is tilted _________ the sun, the season in that hemisphere is winter.

26. Bingo  This angle of sunlight is less concentrated

27. Bingo  This angle of sunlight is concentrated

28. Bingo  This place always receives INDIRECT sunlight

29. Bingo  When the earth is tilted _________ the sun, the season in that hemisphere is summer.

30. Bingo Vocab When the Northern Hemisphere is tilted toward the sun, the season is…

31. Homework  2.4 Homework

32. Exit Questions 1. How does the tilt of the Earth cause seasons? (Hint: use the words “intensity” and “sunlight”) 2. Where on Earth is it always the same season? 3. Look at the picture to the right. What season is it in the Northern Hemisphere? Explain in a complete sentence.