EARTHS STRUCTURE Flashcards
how thick is the oceanic crust
6-10KM
what rocks is the oceanic crust made from
sedimentary
how thick is he continental crust
30-60KM
what rocks is the oceanic crust made from
ganite
what is it called where the crust meets the mantle
continental shelf
what is the asthenosphere
upper mantle
what is pangea today
laurasia and gonwanaland
what proof is given that pangea existed
matching coasts = africa and south america
matching mountains = scandanavia and usa
what is the name given to plates that separate
constructive divergent
what is the name given to plates that collide
destructive convergent
what is the name given to plates that slide past eachother
tranverse
what is formed from constructive plates
mid ocean ridges
what is a rift valley
as the crust splits a rift valley allows the maga to rise and fill the gap
examples of divergent plates
usa and europe
what is formed at continental continental convergent plates
fold mountains
example of fold mountains
himalayas from the eurasian and indian plate
what is formed at oceanic and continental convergent plates
subduction zones
what happens at a subduction zone
heavier oceanic crust slides under the continenta crust
melted crust turns to magma and moves up tjhrough the continental crust creating volcanoes
trenches are also created where the two plates collided
what are terranes
sediments carried on the sea floor when thr oceanic plate sinks the sediments stick to the side of the continental plate
what is formed at oceanic oceanic plates that collide
trenches and island arcs
what happens at oceanic oceanic plates that collide
one subducts and a trench is formed, eat=rth quakes occur. Volcanic islands called sea arcs occur
what is the name given to rising melted magma that breaks through the crust
plumes
what are transverse plate boundaries marked by
fault lines
name a plate boundary line
between the pacific plate and north american plate
