請求解答有關plate的問題!!!

你form幾?
不如去補linda lau啦
真係好有用~

the ocean trench only occurs in destructive plate boundary with a continental crust, such as, euroasian plate, and an oceanic crust, such as pacific plate .
when the continental crust crash into the oceanic crust. the oceanic crust will subduct to the continental crust. the reason is that the oceanic crust is denser than the continental crust. at the zone of subduction occuring, its above is the part of ocean trench.

2007-01-13 14:54:50 補充：
when the two plates move towards each other with a strong force, there will be earthquake. therefore, when the continental crust crash into the oceanic crust with a great force, there is an earthquake.

2007-01-13 14:55:13 補充：
In the case, the oceanic crust will subduct to the continental crust. the reason is that the oceanic crust is denser than the continental crust. at the zone of subduction occuring, its above is the part of ocean trench. That is how the earthquake relating to the formation of ocean trench.

2007-01-13 14:56:10 補充：
In the case=in this case