Plate Tectonics Short Q's Flashcards
What are oceanic plates made up of
Heavy dense silicon and magnesium rich rock
Example of a type of rock oceanic plates would be made of
Basalt
What are continental plates made up of and example of rock
Light alluvium rich rock eg Granite
What is subduction
When a oceanic plate slides under a continental plate into the magma and is destroyed and recycled
What happens during subduction
The oceanic crust melts and the magma moves up through the continental crust to form explosive volcanic mountain ranges (the Andes)
Example of a volcanic mountain range
The Andes
What type of boundaries formed the Andes
Oceanic and continental
Other than volcanoes what is also common at subduction zones
Deep earthquakes
What forms at the boundary of colliding plates
Deep trenches
What are associated with deep trenches
Earthquakes
Give can example of a deep trench
The Peru-chile 8km deep
How are fold mountains formed at o + c
As the o crust slides into mantle the sediment on the floor are scraped off and folded up against the continental plate forming fold mountains
What do the sediments scraped off sea floor form
Unique geological areas called terranes
Give example of o + c Terrane
The Andes in Peru
