lesson 4
February 16, 2011
The Reasons
for the
Seasons
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lesson 4
February 16, 2011
Many people believe that the seasons on Earth are caused by
variations in the distance between the Earth and the sun.
In the beginning of this unit we made a
chart about what we think about
seasons. Let's revisit that idea and
complete the chart again. Later in the
unit we will answer the same question
and compare all three charts.
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lesson 4
February 16, 2011
What do we think about the seasons now? What can we do to find out more? AutoSave
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lesson 4
February 16, 2011
You and your partner will design and make a presentation that
will demonstrate the reason for the seasons on Earth.
On page 10 of your science journal are the directions to build
your model of the Earth. All the materials you need can be
found on the back table.
While you are making your model think about these things:
• How does your model represent the Earth?
• How is it similar to the globe?
• What concepts do you plan to demonstrate with your model?
• How can you convince your audience that you are correct?
• What evidence do you already have and still need?
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lesson 4
February 16, 2011
You will use your model to give an oral presentation that explains
the reasons for the seasons. Here is what I will be looking for:
Models of the Earth will: Yes No 1. demonstrate the axis of the Earth. 2. demonstrate the equator.
3. demonstrate the angle or tilt of the Earth. (23.5 degrees) 4. demonstrate where Michigan is on the Earth. 5. demonstrate the rotation of the Earth on its axis.
6. demonstrate the position of the sun using a flashlight. AutoSave
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lesson 4
February 16, 2011
Presentations explaining the reason for the seasons will include: Yes No 1. the use of the model of the Earth. 2. a demonstration of the position of the Earth for:
a. the winter solstice (December 21)
b. the vernal equinox (March 21)
c. the summer solstice (June 21)
d. the autumnal equinox (September 21)
3. an explanation of the period when Michigan reveives the most direct rays of sunlight. 4. an explanation of the period when Michigan receives the least direct rays of sunlight. 5. an explanation of how the Northern and Southern Hemispheres have opposite seasons. 6. participation by both team members. 7. a diagram of the orbit of the Earth around the sun. 8. a diagram of the angle of the sun's rays as they strike the Earth on December 21 and on June 21. 9. an explanation of they the distance from the sun in NOT the reason for the seasons, 10. creativity and accurate information. AutoSave
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lesson 4
February 16, 2011
You will give your presentations on
either Thursday or Tuesday afternoon.
Be ready to present on Thursday in
case your group gets chosen first!
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lesson 4
February 16, 2011
Question Correct response Possible reasoning 1. The Earth is closer to the sun in the summer. 2. the Earth is tilted on its axis. 3. Winter daylight hours are longer than summer daylight hours. 4. You get sunburned more often during the summer.
5. Summer in Australia is at the same time as summer in the United States
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