day 3 earth layers
TRANSCRIPT
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9/15/11LEQ: HOW does continental drift happen?
(reminder: complete sentences!)1. What is Pangaea?2. What is the theory of continental drift?3. What different types of evidence do we have to support this theory?4. Is it possible to find ice evidence in Jamaica? Explain.
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AGENDA:
• WORK TIME• ACTIVATING STRATEGY• NEW LEQ NOTES/MATERIAL• DEMOS• PRACTICE
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Today’s LEQ: How does continental drift happen?
By the end of today, you should be able to…1. Explain the geologic conditions that allow
continents to move2. Describe convection currents that cause the
continents to move
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KEY VOCABULARY8. Plate tectonics9. Convection Currents10. Lithosphere11. Asthenosphere
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Activating Strategy
• http://www.youtube.com/watch?v=TzzGPfVx32M
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We know that the continents moved apart….BUT HOW IS THIS POSSIBLE?!
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LAVA LAMP SCIENCE
• http://www.youtube.com/watch?v=YgGHl_gRiYU&feature=related
• HOW DOES A LAVA LAMP WORK?
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Demo Time!
• WATCH!• What was the difference between
when the food coloring was placed over the hot liquid vs. the cold liquid?
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Making observations: WATCH THE EARTH’S MANTLE!
• http://education.sdsc.edu/optiputer/flash/convection.htm
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Making Inferences:• What do all of these things have in
common?HEAT!
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Key Point• The movement of the food coloring represents
the movement of magma in the Earth’s mantle• This movement is what causes Earth’s
continents to move away from each other
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CONVECTION
CURRENTS
DEFINITION: The cycle of magma under the crust as it heats, rises,
cools, and sinks
CAUSES:
DIAGRAM:
EFFECTS:
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DIAGRAM:
INNER CORE
OUTER CORE
Mantle
Plates move!
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HOT Q:• How would the position of
the continents have been different if the inner core was made of a solid block of ice and not hot iron?
a. The continents would still be one mega continent, Pangaea
b. The continents would be the same position as they are today
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LITHOSPHERE:
ASTHENOSPHERE:
TECTONIC PLATES:
(THIS GOES UNDERNEATH YOUR FRAYER DIAGRAM)
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CONTINENTS ADRIFT• What form of matter (solid, liquid, or gas) do
you think the crust is made of?
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What about the oceanic crust?!
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LITHOSPHERE: the rocky crust and the solid top layer of the mantle
ASTHENOSPHERE:
TECTONIC PLATES:
(THIS GOES UNDERNEATH YOUR FRAYER DIAGRAM)
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DEMO: CONTINENTS ADRIFT• What form of matter do you think lies
underneath the lithosphere?
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LITHOSPHERE: the solid crust and the rigid top layer of the mantle
ASTHENOSPHERE: the liquid, tar-like layer below the lithosphere
TECTONIC PLATES:
(THIS GOES UNDERNEATH YOUR FRAYER DIAGRAM)
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LITHOSPHERE: the solid crust and the rigid top layer of the mantle
ASTHENOSPHERE: the liquid, tar-like layer below the lithosphere
TECTONIC PLATES: huge slabs of the lithosphere that move because of convection currents
(THIS GOES UNDERNEATH YOUR FRAYER DIAGRAM)
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CONVECTION
CURRENTS
DEFINITION: The cycle of magma under the crust as it heats, rises,
cools, and sinks
CAUSES:
Hotter core temperatureLiquid asthenosphereRigid lithosphere
DIAGRAM:
EFFECTS:
Tectonic plates “drift” apart!
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Steps of Convection Comics!!1. Use the list at your desk to put the steps of
convection in order (the first one is done for you)
2. Draw a comic strip for the four steps of convection currents!
3. Your comic strip should include:A) 4 boxes (1 for each step in the cycle)B) 4 illustrationsC) the four steps of convection (you may copy the 4 steps exactly if you like, but you are encouraged to be creative!)
Liquid magma in the mantle is heated by the earth’s core
(add illustration here)
EXAMPLE:
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SUMMARIZER• Watch the video again • This preview is for a movie called
“Ice Age: Continental Drift”• In 3 sentences or more, explain why the continents
ACTAULLY move—(hint—it is not because of a squirrel running around…)
• YOU MUST USE EACH OF THE FOLLOWING VOCABULARY FOCUS WORDS in your answer!!!-Lithosphere-Asthenosphere-Convection Current(s)-Tectonic plates
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Let’s REVIEW: Earn your seat• What is the name of the mega continent?• Who proposed the theory of continental drift?• What is the theory of continental drift?• What are the 3 types of evidence that support this
theory?• Why do the continents move apart?• How do convection currents cause the plates to move?• Why is it possible we could find fossils of tropical plants in
Alaska?• How is it possible that similar animal fossils are found on
two separate continents?