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Earthquakes
ISEB Revision Guide
26
Geography
7th Grade
10/29/2013

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Cards

Term
What are tectonic plates?
Definition
The semisolid rock beneath the crust.
Term
What are the light, thick plates called?
Definition
Continental plates
Term
What are the thin, heavier plates called?
Definition
Oceanic plates
Term
What is the movement of plates called?
Definition
Continental drift
Term
What can continental drift do?
Definition
Push plates together and apart.
Term
How is continental drift caused?
Definition
Due to the movement of the magma beneath the plates.
Term
How is the movement of the magma caused?
Definition
The movement of the magma is caused by convection currents generated by the immense heat at the Earth's core
Term
What are the edges where the plates meet called?
Definition
Plate boundaries
Term
What are the four types of plate boundary?
Definition
Constructive destructive conservative (or sliding) and collision.
Term
What is the first feature of a constructive plate boundary?
Definition
At a constructive plate boundary two plates move apart.
Term
What is the second feature of a constructive plate boundary?
Definition
Magma rises to the surface, due to gas bubbles in the magma that make it lighter than the surrounding rock.
Term
What is the third feature of a constructive plate boundary?
Definition
Volcanoes are formed.
Term
What is the fourth feature of a constructive plate boundary?
Definition
Gentle eruptions occur which may continue for years.
Term
What are features of most constructive boundaries?
Definition
They are under the sea and the form chains of volcanic islands.
Term
What is a famous constructive plate boundary?
Definition
The Mid-Atlantic Ridge is the most famous.
Term
What is the first feature of the destructive plate boundary?
Definition
At a destructive plate boundary, and oceanic and continental plate collide.
Term
What is the second feature of the destructive plate boundary?
Definition
The heavier oceanic plate sinks under the continental plate into what is known as a subduction zone.
Term
What is the third feature of the destructive plate boundary?
Definition
The melted crust rises (due to the gas bubbles in the magma that make it later than the surrounding rock) to form explosive, dangerous and volcanoes.
Term
What is the fourth feature of the destructive plate boundary?
Definition
When the two plates rub together, friction occurs, leading to earthquakes.
Term
What is the most famous destructive boundary?
Definition
The most famous destructive boundary is the Pacific Ring of Fire, which forms a band of earthquakes and volcanoes round the edge of the Pacific Ocean.
Term
What was the cause of this Soufriere Hills volcano, Montserrat?
Definition
A destructive plate boundary.
Term
What is the first feature of a Conservative (or sliding) plate boundary?
Definition
At a conservative plate boundary, two plates slide past each other.
Term
What is the second feature of the Conservative (or sliding) eight boundary?
Definition
The plates become locked and tension builds up over years.
Term
What is the third feature of the Conservative (or sliding) boundary?
Definition
Eventually the plates for jolt past each other, causing powerful earthquakes.
Term
What is the fourth feature of the Conservative (or sliding) plate boundary?
Definition
Volcanic activity does not occur.
Term
What is the most famous conservative (or sliding) plate boundary?
Definition
The most famous of these is the San Andreas fault.
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