Show:
Continental Drift
Plate Tectonics
Boundaries
Potpourri
Events and Landforms
100
Who developed the theory of continental drift?
Alfred Wegener
100
What layers, or part of layers make up the lithosphere?
The crust and upper mantle.
100
How many types of boundaries are there?
3..........I will accept 4 (boundary zones are where we don't know what's going on)
100
Which Boundaries destroy old crust and create mountains?
Converging Boundaries
100
Most Earthquakes
Transform Boundaries
200
How do we measure the movement and direction of one continent?
We compare it to another continent. (relative to one another)
200
Why do the plates "float" on the lower mantle?
The lower mantle is more dense than the plates.
200
What is the type of boundary when 2 plates move away from one another?
Divergent Boundary
200
Where does sea floor spreading occur?
Divergent boundaries under the ocean.
200
Coastal Mountains, Some Volcanoes
Ocean-Continental Convergent
300
What evidence do we have that the continents were all once together? list 2
fossil records, landforms, rock layers, puzzle like fit, etc..
300
What role do convection currents play in plate tectonics?
The push or pull the plates. (cause it to move)
300
What direction do transform boundaries move in relation to one another?
They slide past one another
300
What is the "subduction zone"?
The area where one plate moves beneath another.
300
Folded Mountains (non-volcanic)
Continental-Continental Convergent
400
About how many years ago do we think Pangaea existed?
220 million to 450 million years ago
400
How many major plates make up the Earth?
15
400
What boundary has two plates moving toward one another?
Convergent Boundary
400
How does a plate move beneath another one?
As they move together, the more dense plate gets pulled back into the mantle.
400
Island Arcs
Oceanic-Oceanic Convergent
500
When did continental drift stop?
It didn't. The plates are still moving today.
500
What determines the boundary types between two plates?
The direction that the convection currents relate to one another. (toward one another, away from one another, roll past one another)
500
What are the three types of converging boundaries?
Ocean-Ocean Ocean-Continental Continental-Continental
500
If a divergent boundary occurs on land, what landform does it create?
A rift valley
500
Why don't mountains where two continental plates have come together become volcanic?
The continental plates are too thick for the magma to rise in most cases.