Plate margins Flashcards
Oceanic/Continental Destructive
Oceanic crust denser so subducted. Deep sea trench formed at the subduction zone. Crust melts in mantle and floats back to the surface and erupts
Oceanic/Oceanic Destructive
Deep sea trench formed triggering earthquakes and eruptions. Melted materials rise to create a chain of volcanic islands (Island arcs)
Continental/Continental Destructive
Rocks crumble together to form fold mountains (Himalayas)- or forms earthquake as neither can subduct eachother
Oceanic/Oceanic Constructive
Plates move apart and magma rises to fill space and creates mid ocean ridges.
Continental/Continental Constructive
Plates moves apart and magma rises and causes rift valleys. Volcanoes form when magma melts due to pressure then rises. Earthquakes occur due to plates moving non-uniformally, the plate cracks causing a fault line
Conservative
Two plates move past each other get locked together and pressure builds up. They jerk past each other releasing energy as an Earthquake