3.1.5.2 Plate Tectonics

Question 1

structure

Answer 1

inner core, outer core, mantle, crust

Question 2

asthenosphere

Answer 2

the semi molten larger area of the mantle

Question 3

moho discontinuity

Answer 3

separates the crust from the mantle

Question 4

plates colliding form…

Answer 4

subduction zones, earthquakes, volcanoes, fold mountains, deep sea trenches

Question 5

plates torn apart form…

Answer 5

volcanoes, ocean trenches

Question 6

alfred wegeners theory in 1912

Answer 6

single super-continent, pangaea, existed 300million years ago
later split into 2 continents- Laurasia in north, Gondwanaland in south
splitting of these formed todays continents

Question 7

why plates move

Answer 7

continental drift
gravitational sliding/ridge push
slab pull
thermal plumes

Question 8

gravitational sliding/ridge push

Answer 8

constructive boundaries
along ocean ridge, gravity pulls slopes
crust repeatedly torn causing shallow quakes

Question 9

slab pull

Answer 9

destructive boundaries
gravitational pull of oceanic plate into mantle
subduction caused friction build so deep, shallow quakes

Question 10

benioff zone

Answer 10

an inclined zone where many deep earthquakes occur, situated beneath a destructive boundary where oceanic crust being subducted