Plate Movements
Theories
Layers of the Earth
Earthquakes
Volcanoes
100
This occurs when two plates move away from each other.
What is a divergent boundary?
100
The hypothesis that continents move slowly
What is continental drift
100
the type of boundaries that earthquakes occur along
What are convergent, divergent, and transform
100
new seafloor is created here
What is a mid-ocean ridge
100
At transform boundaries, ____________ are created.
What are faults?
200
This occurs when two plates slide past each other.
What is a transform boundary?
200
The theory that all continents might have been conected in one large landmass.
What is Pangaea
200
an instrument that records seismic waves
What is a seismograph
200
this type of rock is located closest to the ridge
What is youngest
200
At divergent boundaries, ________________ can be formed.
What are valleys?
300
This occurs when an oceanic plate crash into each other.
What is convergent boundary?
300
Harry Hess's theory that molten pieces of mantle are creating new crust on the ocean floor.
What is seafloor spreading
300
Volcanoes cannot form on a continent to continent convergent boundary because this does not occur
What is subduction
300
as new rock is formed the old rock moves ________ from the ridge.
What is away
300
At convergent boundaries, ______________ can be produced.
What are mountain ranges?
400
The San Andreas Fault in California is an example of a _______________________ boundary.
What is transform boundary?
400
sections of Earth's crust and upper mantle
What are plates
400
the largest type of volcano
What is a shield volcano
400
the center of the mid- ocean ridge is called a _______ another word for a crack or crevice.
What is a rift.
400
When a continental and oceanic plate collide they volcanoes and ________________.
What are trenches
500
The Great Rift Valley in Africa is an example of a _________________ boundary.
What is divergent boundary?
500
The cycle of heating, rising, sinking, and cooling that may explain why the plates move
What are convection currents
500
a building that is able to withstand the vibrations of an earthquake
What is seismic safe
500
This is forced up at the mid-ocean ridge and slowly cools to produce new rock.
What is magma
500
New crust is formed at a ____________________.
What is a mid-ocean ridge.
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