Plate Margins and Earthquakes

Question 1

Destructive Plate Margin and the result of them?

Answer 1

• Plate is Destroyed
• Occurs when oceanic crust meets a continental crust
• Oceanic crust is denser then continental crust, it is made from basalt from the mantle
• Continental crust made from granite
• Oceanic crust subducts into the mantle

Result- Earthquakes, Volcanos, Fold Mountains, Subduction trenches.

Question 2

Constructive Plate Margin? (boundaries)

Answer 2

• Most commonly where 2 oceanic plates move apart
• Where magma rises it creates new oceanic crust
• Rising magma creates a ridge ( Mid-Atlantic ridge)
• This helps the plates move through the process of ridge push
• There are Volcanos and Earthquakes but not very powerful

Question 3

Conservative Plate Margin?

Answer 3

• These plates are relative to each other, crust is neither made or destroyed
• Create earthquakes, some are very large (San Andreas fault in California)
• It is a right-lateral strike slip fault ( move past each other horizontally)

Question 4

Collison Plate Margin?

Answer 4

• 2 continental plates collide
• As they are same densities neither 1 subducts
• Instead they buckle upwards
• Can be deadly earthquakes