Plate Tectonics
Plate Boundaries
Sea Floor Spreading
Layers of The Earth
Alfred Wegner
100
How many major plates is the Earth split into?
Seven
100
This type of plate boundary occurs when two tectonic plates move apart
Divergent Plate Boundary
100
Who proposed the hypothesis of Sea Floor Spreading?
Herman Hess
100
What are the four main layers of the Earth
Crust, Mantle, Outer Core, Inner Core
100
What is the theory that Wegner put in place?
Continental Drift theory
200
About how many volcanoes make up the ring of Fire?
300
200
This type of plate Boundary creates fault zones
Transform Sliding Boundary
200
New ocean floor is created at what?
Mid Ocean Ridges
200
What is the semi ridged part of the middle mantle called?
Asthenosphere
200
What evidence did Wegener use to prove his point?
Similar Fossils and mountain ranges found on different continents. Groves by glaciers were also found on different continents.
300
What can be found at the edges of these Tectonic Plates?
Earthquakes and Volcanoes
300
This type of Plate Boundary occurs when two plates move together.
Convergent Plate Boundary
300
Ocean Floor is destroyed at what?
Subduction zones
300
The crust and upper part of the mantle make up a zone of rigid, brittle rock called what?
Lithosphere
300
What did the evidence he found about continental drift lead to?
Supercontinent Pangea
400
About how many inches do tectonic plates move per year?
1/2 - 4 inches
400
The Mid Atlantic Ridge is an example of what Plate Boundary?
Divergent Plate Boundary
400
The age of the sea floor is oldest near the what?
The Continents
400
Is the Inner core in a solid or liquid state?
Solid State
400
Did people believe Wegnerś theory when he first announced it to the public?
No, they did not.
500
Name the seven Major Plates that the Earth contains
North American Plate, South American Plate, Eurasian Plate, Australian Plate, African Plate, Pacific Plate, and Antarctic Plate
500
What is an example of a Convergent Collision Folded Mountain?
Himalayan Mountains
500
What does the Earthś magnetic field do every few thousand years
It reverses itself
500
What causes the semi rigid part of the middle mantle (Athenoshere) to flow?
Convection Currents
500
Wegner Couldn´t answer the fundamental question about his theory, what was it?
He could not answer what forces were great enough to move such large masses of solid rock over such great distances.
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