tectonic hazards Flashcards
(27 cards)
what is the temperature thickness and substance of the crust
-50-50
thin skin of rock
0-100km
what is the temperature thickness and substance of the mantle
500-900
thick molten liquid
2900km
what is the temperature thickness and substance of the outer core
4700
magma
2200km
what is the temperature thickness and substance of the inner core
5430
solid iron and nickel
1260km
name the two types of crust
oceanic and continental
what is the oceanic crust made of and is it heavier or lighter
basalt heavier
what is the continental crust made of and is it heavier or lighter
granite lighter
what is the name of the supercontinent
pangea
what two continents were made by the supercontinent
Laurasia and Gondwanaland
give four pieces of evidence for continental drift
the continental jigsaw
fossil correlation
rock and mountain
past climate and ice sheet data
continent
one of 7 large land masses on earth
county
a small part of a country
continental drift
study of the movement collision and division of continents
where are tectonic hazards most likely to occur
on plate boundaries
how should you write an explanation paragraph
point
example/evidence
explain
describe a constructive plate boundary
two plates move apart
molten magma rises to fill the gap
this creates new rocks on the sea bed
over time the layers build up and break through the surface of the ocean
describe a destructive plate boundary
two plates collide and the heavier oceanic plate is subducted
the oceanic plate sticks as it moves under
heat starts to melt the subducted plate
the magma rises through the gaps and forms volcanoes
describe a collision plate boundary
two continental plates crash
the collision triggers earthquakes
the rocks between the plates get pushed up and folded
describe a conservative plate boundary
two plates are moving in the same direction but one is faster
as they slide past they snag
pressure and tension build up as the plates lock together
eventually the plates surge apart
give an example of a constructive plate boundary
north american and eurasian plates
give an example of a destructive plate boundary
south american and nazca plates
give an example of a collision plate boundary
indo-australian and eurasian plates
give an example of a conservative plate boundary
north american and pacific plates
what tectonic hazards are caused by constructive plate boundaries
ocean ridge
volcano
