Convergent Plate Margins

Question 1

Name the 3 types of convergent plate margins

Answer 1

• Oceanic and continental
• Oceanic and oceanic
• Continental and continental

Question 2

Outline what occurs when oceanic crust meets continental crust

Answer 2

• Oceanic pushes against continental
• Oceanic sinks below continental
• Oceanic lithosphere subducts under less dense continental lithosphere
• Oceanic crust descends into mantle (A.K.A. Subduction slab)

Question 3

Outline what occurs when oceanic crust meets oceanic crust

Answer 3

• One plate slightly older and denser than other
• Denser plate subducts into mantle, forming subduction zone
• Subducting plate forms very deep depression called a trench e.g. Mariana Trench (11km deep)

Question 4

Outline what occurs when continental crust meets continental crust

Answer 4

• Known as collision margin
• No subduction takes place
• Ocean sediment trapped between two plate heaved upwards forming fold mountain ranges

Question 5

What hazards occur at convergent plate margins?

Answer 5

• Violent and gentle earthquakes

- Explosive volcanic activity