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Plate Boundaries
Men and Theories
Evidence for theories
Around the World
Other
100
where two plate collide
What is a convergent boundary?
100
he developed the Theory of Continental Drift
Who is Alfred Wegener?
100
the fossil of this aniaml supported the theory of continental drift by showing that Africa and South America were once connected
What is messosaurus?
100
boundary that forms the San Andreas fualt
What is a transform boundary?
100
about 80% of volcanoes occur here
What is convergent boundaries?
200
where two plates move apart
What is a divergent boundary?
200
He developed the Theory of Seafloor Spreading
Who is Harry Hess?
200
the reason glossopertis support the theory of continental drift
What is it was found on 5 continents with 5 different climate (no plant would be able to do that), so they must have been connected? What is it was found in Antartica where it is impossible for plants to grow, so Antartica must have been in a differnt place?
200
mountains formed by converging continental and continental crust
What are the Himalayan Mountains?
200
about 5% of volcanoes occur here
What is a hot spot?
300
where two plates slide past each other
What is a transform boundary?
300
the Theory of Plate Tectonics
What is the belief that Earth's crust is broken into plates that move on top of the mantle?
300
showed that the Appalachian Mountains, Greenland and western Europe were once in the same place
What are rocks of the same age and composition?
300
diverging continental crust that may cause a new plate to form and a continent to split apart
What is the Great Rift Valley?
300
the speed at which the Pacific Plate is moving
What is about 9cm per year?
400
place where one plate goes under another plate
What is a subduction zone?
400
the relationship between Hess's theory and Wegener's theory
How the continents moved (Hess's theory explained how Wegener was possible)?
400
this evidence showed that new crust was being formed at the mid-atlantic ridge
What is the age of rocks surrounding the ridge? (youngest at the ridge and older further away) What is the semmetry and age of the magnetic clues stored in the crust?
400
location of a subduction zone (Pacific Plate and North American Plate) that has produced a series of volcanic islands
What is the Aleutian Islands?
400
this location has the most active extrusion of lava on the island of Hawaii
What is Loihi?
500
this characteristic causes one plate to go under another
What is density?
500
Hess's belief about the mid-atlantic ridge
What is the idea that magma was rising at the ridge and forming new crust, which was pusing old crust out of its way?
500
the Hawaiian Islands support this theory because.....
What is the Theory of Plate Tectonics because they show that the Pacific Plate moves over a stationary hot spot producing a chain of islands with the oldest furtherst from the hot spot and youngest above the hot spot?
500
convering oceanic and oceanic crust
What is the Marianas Trench?
500
a chain or cluster of islands that are formed teconically
What is an archipelago?