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plate tectonics (boundary (divergent (divide, only place where new crust…
plate tectonics
boundary
divergent
divide
only place where new crust is formed
transform
two plate pass eachother
earthquakes
tsunamis
convergent
the plates move towards eachother
oceanic crust=made up of metals
continental crust=made of silica
collide
continental drift
evidence that the sea floor is spreading apart
sediment thickness
thick at the edges and thin in the middle
age of the ocean floor is young in the middle and old at the edges
magnetic reversals
positive and negative strips=seafloor is spreading
how?
continets fit like a puzzle
fossil match
ancient climates
geologic units match
hot spots