Continental Drift
Sea-floor Spreading
Subduction
The Theory of Plate Tectonics
Review
100
Who came up with the theroy of conteninental drift?
Alfred Wegener
100
What are mountain ranges that runs along the middle of some ocean floors?
Mid-Ocean Ridges
100
What is subduction?
The process of which the ocean floor sinks under another plate and goes back into the mantle.
100
What are the pieces of the Earth's crust called?
Plates
100
What is the process in which atoms are arranged to form a material that has a crystal structure?
Crystallization
200
What is the name of the super continenet that existed 300 million years ago?
Pangea or Pangaea
200
What device did scientists use in the 1900's to map the ocean floor?
Sonar
200
Where does subduction occur in the ocean?
Deep-Ocean Trenches
200
What is the boundary called when two plates move apart?
Divergent boundaries
200
What kind of rocks form from the cooling of magma or lava?
Igneous rock
300
They say the continents are like puzzle pieces, so what does south america look like it joins with?
Africa
300
What do they call the process of new material being added to the ocean floor?
Sea-Floor Spreading
300
What type of bounderies are formed where subduction occurs?
Convergent boundaries
300
What is the boundary called when two plates slip past each other?
Transform boundaries
300
What do we call the effects of freezing and thawing, plants roots, acid and other forces on rock?
Weathering
400
What was Wegener's book called?
The Origin of Continents and Oceans.
400
What shape does the lava make when hardens on the ocean floor?
Pillowy look
400
Which ocean is shrinking because of subduction?
Pacific Ocean
400
What happens to the earth when two plates slide past each other?
Earthquakes
400
Which theory is closely related to the rock cycle?
Plate Tectonics
500
What three types of evidence do they use to support continental drift?
1. Fossils 2. Puzzle like fit 3. Climate
500
How do scientists find out the age of rocks on the ocean floor?
They drill holes and collect rock samples
500
How long does it take for the ocean to completly renew its self?
About 200 million years
500
What are rift valleys?
Where pieces of earths crust diverge on land
500
What is the big question for chapter 2?
How do rocks form?
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