alfred wegener 1912, looked at fossils and was puzzled. he ......2017/04/13 · 4.7.2017 all of...
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4.7.2017 All of Earth science.notebook
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April 13, 2017
Alfred Wegener 1912, looked at fossils and was puzzled. He then took a map and solved the puzzle.
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Pangaea...
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Alfred Wegener had great ideas and a well developed theory... what was he missing? Why didn't people believe this idea?
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Alfred Wegner's ideas died with him in 1930. 30+ years later Harry Hess provided the missing link "Sound Navigation and Ranging" aka SONAR during WWII. (He was on the ship during the war but published his findings later)
Harry Hess was able to "see" features of the ocean floor. It provided Alfred Wegner's theory with proof of movement.
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A deep thought Shadow, the dog, enjoys digging in his owner's backyard during the summer months. One day Shadow begins to dig a hole and doesn't stop digging until the day is over. Shadow's owner is worried that his dog might dig a hole to China and therefore leave his owner. Your job is to take the role of a neighbor and to calmly explain why this not possible. Shadow's owner will not be convinced unless he is told three reasons why he should not be worried (reasons that pertain to the composition of the Earth).
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Focus questions for the activity:
1. Why is there an inner and an outer core? What is the difference?
2. What exactly is the Mantle made of? how does it move? How are the Mantle and the Crust similar/different?
3. How thick is the crust?
4. What is the difference between the asthenosphere and the lithosphere?
5. How do we know about the layers of the Earth?
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3,959 miles- Radius
7,917.5 miles- Diameter
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What happens near the crust of the Earth?
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Do now: Why does California get earthquakes all the time and we don't?
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Transform plate boundary
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Divergent plate boundary
Here the magma pushes upwards and pushes the plates. The plates move in the directions indicated by the arrows.
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The Great Rift Valley in Africa, what are some features you notice?
Magma pushes these plates apart. The continental crust is thick and you will not see magma on the surface. Water fills in the gap between magma and the surface. We see this water as lakes.
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Volcanoes form on the continent at a convergent plate boundary between continental and oceanic crust.
Volcanoes form as islands at a convergent plate boundary between oceanic and oceanic crust.
Features here include subduction, trench, and earthquakes
Features here include subduction, trench, and earthquakes
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Mountain building
Subduction does not occur at a convergent plate boundary between two pieces of continental crust. Continental crust is not dense enough to subduct, the result is the two pieces of crust being pushed upwards.
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a
b
c a. Island arc
b. ring of fire
c. Seattle
Japan formed as
a volcanic island.
an area of the world where the Pacific Plate is being subducted and volcanoes form.
Volcano is in the background. Seattle is on the Ring of Fire