Pangaea
Seafloor Spreading
Plate Boundaries
Effects of Plate Tect.
100
Who first proposed the idea of continental drift?
Alfred Wegener.
100
What is seafloor spreading?
The process of the ocean's floor expanding when two plates move apart.
100
What is the name of a boundary at which two plates collide?
Convergent boundary.
100
What are the most common natural creations caused by plate movement? (2/3 necessary to get question right).
Volcanoes, Earthquakes, and Mountains.
200
When was the idea of Pangaea and continental drift first proposed?
In 1912, during a lecture by Alfred Wegener.
200
Continental crust is _______ in temperature than oceanic crust.
Higher.
200
What are the three different types of plate boundaries?
Divergent, convergent, and transform boundaries.
200
Pieces of the Earth's crust move on the ______.
Mantle.
300
What does 'Pangaea' mean?
"All land".
300
Divergent boundaries are when two plates move _____.
Apart.
300
What is a transform boundary?
A transform
300
Subduction is when _________.
One plate slides under another.
400
The fossils of what reptile were found in South America and Africa, supporting Wegener's theory?
The 'mesosaurus'.
400
What causes the plates to move?
Convection currents.
400
Volcanoes occur most often along ______ boundaries.
Convergent boundaries.
500
What is the name of the island in the Artic Ocean on which warm weather plants were found? (Leading Wergener to believe that the island had drifted to its current location).
The island of Spitsbergen.
500
What kind of boundary causes seafloor spreading?
Divergent boundaries cause seafloor spreading.
500
A divergent boundary is when to plates _________.
Separate, or pull apart.
500
Oceanic crust is (less/more) dense than continental crust.
More dense.
M
e
n
u