2.1
what is an earthquake
an earthquake is a sudden violent period of ground shaking. most occur at the margins of slowly miving tectonic plates. friction and sticking between plates create wnormus pressures and stresses which build to breaking points
how is the earths crust split up
severn major and several minir tectonic plates
what are two types of crust
oceanic continental
oceanic plates
denser and thin
continental plate
less dense thicker
what dirrection do constructive playes move
away from each other
what do construction playe margins cause
volcanic eruptions
what direction do destructive plates move
towards each other
what do destructive plate margins cause
subduction, earthquakes, volcanic eruptions, fold mountains
what direction do conservative plates move
slide along each other
what do conservative plate margins cause
earthquakes
where are volcanos distrubuted
volcanos are large often cone shaped landforms formed over long periods by several eruptions. they are fed bu molten rock deep within the earths mantle.
where do most earthquakes occur
belts along plate margins skme occur at jotspots where the crust is thin and magma breaks through the surface