Clasified in Notes of Geography of Secondary.
Written at October 12, 2009 on 
English with a size of 1,066 bytes.
Earthquakes and volcanic eruptions are caused by movements whithin the Earth.
Plates consist of two tipes of crust: continental a n oceanic. Continental crust is oloder, lighter, cannot sink and is permanent.
Oceanic crust is younger, heavier, can sink and is constantly destroyed and replaced.
Constructive margins occur when two plates move away from each other, it form a new oceanic crust.
Destructive margins occur when a oceanic crust move towars an continental crust, it can form an island arc.
Collision margins occur when two continental crusts move together, it form an fold mountain.
Conservative margins occur when two plates slide past one another, it can create an earthquake.
A volcanoeerupts because
When a volcano erupts the poisonous gases and the blast waves kill people, the logging caps destroys, the ash contaminate the rivers an lakes and it kill all the fishes, the cars crashes, some trees destroys, electricity and telephones crashes,some of the vegetables and fruit destroys.
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