Transform Boundary
What direction do the plates move in a transform boundary?
Across
What direction do the plates move in a divergent boundary?
Away
What direction do the plates move in a convergent boundary?
Towards
The earth is broken up into pieces called
Tectonic Plates
Witch boundary causes the most earthquakes?
Transform boundaries
What event often happens at a transform boundary?
Earthquakes
When plates separate, what is allowed to rise to the surface?
Molten Rock (magma)
Why does ocean crust sink below continental crust?
It has a higher density
What is the theory that the continents have moved apart over the years?
Continental Drift
When two plats are moving away from each other it is called a _________ boundary
Divergent
Earthquakes happen because the plates are not
Smooth
Divergent boundaries typically occur in the middle of the what?
Ocean
What is created at ocean-continent convergent boundaries?
Volcanoes
The plates move because of ____________ in the mantle
Convection Currents
When two plates are coming toward each other is called a ________ boundary.
convergent
As the plates slide past one another one often gets caught on the other one. This causes _______ to build up. Earthquakes happen when the ______ is released. (same word in both blanks)
Energy
What is created at divergent boundaries?
New seafloor
What is created at continent-continent convergent boundaries?
Mountain Ranges
Tectonic plates are pieces of what layer of the Earth? (not crust)
Lithosphere
How many plate boundaries are there.
Three
This is the force which causes earthquakes as the plates slide against one another.
Friction
These are more common at convergent boundaries but can also be made at divergent boundaries.
Volcanoes
What is created at ocean-ocean convergent boundaries?
Volcanic Islands
Who developed the theory of plate tectonics?
Who is Alfred Wegner?
How many major plates are in the world?
Seven