the restless earth
crust - outter layer of the earth, OCEANIC-thin, dense, 5km thick, CONTINENTAL- thick light rock, 20 and 60km thick.
mantle - hot lava, most of the earth is filled up with this
outer core - liquid
inner core - solid metal, very centre of the earth
techtonic plates - continental and oceanic, causes earthquakes and volcano eruptions
why do techtonic plates move? convection currents
plate boundarys, destructive, constructive, conservative.
composite cone volcanos - destructive
shield volcanos - constructive.