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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
Wegener used fossils to help to support his theory of _____________________________
What is continental drift?
100
The outermost layer of the Earth is called___________________
What is crust?
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
Newly formed crust on the ocean floor that pushes old crust out of the way is called ____________________
What is sea-floor spreading?
200
The Earth's mantle is both a solid and a ____________________________
What is liquid?
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
The Earth's _____________________ reverses about every 500,000 years.
What is magnatic field?
300
The _______________________ is made up of the crust and the uppe mantle.
What is lithosphere?
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
The area where Earth's plates meet is called the ________________________
What are plate boundary?
400
The inner core of the Earth is made of solid ______________
What is iron?
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
An idea that provdes an explantion for an observation is called a _____________________
What are convection currents
500
The crust of the Earth located on dry land is about ________________________ miles thick.
What is 25?
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.