GLG 141 Parks and Plates Pt. 2

evidence of tectonic plates

locations of earthquakes, seafloor spreading

locations of earthquakes are on

plate boundaries

seafloor spreading

measuring the growing distance between continents

why do plates move

convection, ridge push, slab pull

subduction

crust descending into the mantle

ridge push

new crust being formed

three types of plate boundaries

divergent, convergent, transform

divergent plate boundaries

plates move away from each other

convergent plate boundary

plates move toward each other

transform plate boundary

plates move sideways past each other

divergent boundary geology

trenches, basins, new crust being formed

age maps help to identify

divergent boundaries

if there is not symmetry at a divergent boundary there is most likely

subduction

mid ocean ridgge

old divergent boundary

rift zone

young divergent boundary

dry asthenospheric material is

ultramafic and partially melted through decompression melting

decompression melting creates

basaltic magma which creates oceanic crust

as warm asthenosphere rises to the surface

it melts and forms magma

when magma rises to the surface it creates

new crust on each side of the boundary

new crust is

warmer and less dense