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Tectonic hazards (volcanoes (destructive (where the crust is melted a pool…
Tectonic hazards
volcanoes
destructive
where the crust is melted a pool of magma forms
magma rises through cracks - vents
magma erupts onto surface forming volcano
constructive
magma rises through the gap forming volcano
hotspots
over hot parts of the mantle eg. Hawaii
when erupts emits lava + gasses
ash can block out the sun
pyroclastic flows - super heated currents of gas, ash and rock
earthquakes
destructive
friction build when oceanic pass under the continental
constructive
tension builds along cracks within plate
conservative
friction builds when they get stuck moving past
shock waves (S.W) - earthquake
S.W spread from the focus - point in earth where earthquake starts
epicentre straight above the focus
Earths structure
inner core - solid iron and nickle centre
outer core - liquid iron and nickle
mantle - semi molten rock - moves very slowly
crust - outer layer
crust
separated into tectonic plates
Continental
thicker
less dense
oceanic
thinner
more dense
convection currents in mantle move the plates
plates meet at plate boundaries or plate margins
plate margins
destructive
moving towards each other
continental meets oceanic
oceanic is forced under Continental
creates volcanoes
creates ocean trenches
constructive
moving away from each other
magma rises and cools creating new crust
conservative
moving sideways past each other
or moving same direction at different speeds
friction builds up