plate tectonics notes. have the continents always been where they are today? if so, explain how they...
TRANSCRIPT
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Plate Tectonics Notes
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Have the continents always
been where they are today? If
so, explain how they were
made…If not, explain how
they moved to their present
positions and when did they
move.
Warm up 9/10/13
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Your Notes:
On your sheet of paper you should write each part of your class work assignment in addition to the slides listed above.
YOU ARE RESPONSIBLE FOR ALL NOTES, EVEN THE SECTIONS YOU DIDN’T DO!
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Draw Alfred Wegener
Draw the Earth’s layers
with convection currents
(Include Asthenosphere
and Lithosphere)
List and describe 3 of Wegener’s
Evidence of Continental Drift
Explain the theory of
plate tectonics. This
should be detailed
1. Explain how convection works
2. How does temperature in the earth help create cont. Drift?
3. What does density have to do with the composition of the Earth’s layers?
List and explain what scientist learned from
drilling in the sea floor
Draw Wegener
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What is going on?
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So where did it begin?
We don’t exactly know how the universe began but some scientist theorized…
Remember theories are just a HYPOTHESIS!
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Approximately 4.6 billion years ago the Earth was formed when bits of material collided into one another creating larger pieces of gas and solid chunks
Denser materials (heavier) such as iron sank towrds the center of the core
Less dense (lighter) like oxygen and silicon moved towards the surface
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Crust and Mantle: Lithosphere and Asthenosphere
The Earth’s crust and the mantle together make up the Lithosphere
This is the most rigid of all the layers
The lithosphere sits on top of asthenosphere, a layer of hotter, softer rock in upper mantle
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If you look at a map of the world, you may notice that some of the continents could fit together like pieces of a puzzle
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One Giant Landmass…Is it Possible?
http://geography.howstuffworks.com/pangaea-videos-playlist.htm
Tell me in your own words Wegener’s theory.
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What was his evidence
Fossils – Similar fossils found on different continents.
Climate – Climate change shows tropical plants in Greenland and glacial streaks in South Africa.
Rocks – Similar rocks and formations on different continents.
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Fossils
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Climate
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Rocks
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So how did the landmass move?
http://www.youtube.com/watch?v=p0dWF_3PYh4
Plate tectonics
http://www.youtube.com/watch?v=1-HwPR_4mP4
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- Mid Ocean Ridge- Underwater mountain system formed by
divergent plate boundaries.
- Ocean Trench- Deep depression in the ocean floor formed by
convergent plate boundaries.
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AC
D
B
Draw the missing arrows and name the plate boundaries
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Magnetic Reversal*
- The changing in direction of the Earth’s magnetic poles.
- When the Earth’s poles do change direction, the rocks on the seafloor become magnetically charged in the opposite direction.
- The youngest rock records are the closest to the mid ocean ridge
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Compare Earth to a Magnet
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Compare Earth to a Magnet
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Compare Earth to a Magnet
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