Earthquakes

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

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