metamorphic rocks Flashcards
what does metamorphism mean
to change form
metamorphic rocks happen at high ______ and ________
temps, pressures
where are the conditions for metamorphic rocks found
few kilometers below the earths surface
what two ways does metamorphism occur
contact, regional
contact metamorphism
magma moves into rock, happens near a body of magma, changes driven by rise in temp
regional metamorphism
metamorphism of rocks over a large area, large rocks are exposed to really hot pressures and temps, produces larges amounts of metamorphic rocks
what are the agents of metamorphism
heat and pressure
what does heat do
provides energy to make chemical reactions and it comes from magma also changing temps depending on the location underground
what does pressure do
causes more compact with greater density and increases with depth
what are the 2 main categories of metamorphic rocks
foliated and non-foliated
foliated rock
has a bonded or a layered appearance
non-foliated rock
doesn’t have a bonded texture
