destructive plate boundaries and its landforms Flashcards
what are the three types of destructive plate boundary
continental - continental, continental - oceanic and oceanic - oceanic
what landform does a continental - continental create
fold mountains
what properties do the continental crusts have
they have the same properties
does any of the crusts sink
no they push against eachother
what happens to the crust
the crust buckles and cracks pushing up and down high mountain ranges
which lithosphere subducts (continental - oceanic)
oceanic lithosphere subjects under continental lithosphere
what happens to the oceanic lithosphere once it subducts
it heats and dehydrates as it subducts
what happens after the plate is melted
it rises forming a volcano
what happens when two oceanic plates collide (oceanic - oceanic)
one runs over the other causing one to sink into the mantle causing a subduction zone
what then happens to the subducting plate
its bent downwards to form a very deep depression in the ocean floor called a trench
LANDSCAPES
LANDSCAPES
how are young fold mountains formed
two continental crusts push together causing mountains to be pushed up and down into the mantle
how is a deep sea trench formed
the subducting oceanic crust gets bent downwards causing a trench
where are island arcs found
oceanic - oceanic boundary
how is an island arc formed
magma rises forming volcanic island chain
