geog mocks

Question 1

4 layers of the earth

Answer 1

inner core, outer core, mantle, crust

Question 2

main plate boundries

Answer 2

Eurasian plate, north American plate, south American plate, Antarctic plate, pacific plate, Australian plate, African plate

Question 3

difference between oceanic and continental crust

Answer 3

oceanic crust in denser then continental crust therefore gets sub ducted by continental crust

Question 4

what are convection currents

Answer 4

heat causes convection currents in the mantle, these convection currents slowly move the crust around, in some places causing crust to be destroyed, in some places new crust is made.

Question 5

continental drift theory

Answer 5

the theory created stating that all our continents used to be one big land mass. convection currents and movement of the crust caused the land mass to move apart slowly, forming the continents we have today. evidence of this is that fossils of the same species have been found on continents far apart, e.g. Africa and America. also evidence for this is that our continents fit together like a jigsaw puzzle.

Question 6

destructive plate boundary

Answer 6

when a continental plate and an oceanic plate collide, the more dense oceanic plate gets sub ducted and destroyed in the mantle causing magma to rise up.

Question 7

constructive plate boundary

Answer 7

two plates move apart from each other, causing a gap to appear. lava rises up to fill this gap, this creates new land.

Question 8

collision boundary

Answer 8

two continental crusts move together, as neither is more dense neither can get sub ducted. this causes sedimentary rock between the crusts to be forced upwards, causing fold mountains to form.

Question 9

conservative boundary

Answer 9

at a conservative margin, two plates try to move side by side however friction causes them to stick. eventually the friction builds up so much that a catastrophic slip occurs, causing an earthquake.

Question 10

name of ocean ridge

Answer 10

mid Atlantic ridge

Question 11

distribution of fold mountains

Answer 11

rocky mountains, andes, alps, high atlas, zagros mountains, Himalayas, central range, southern alps, maoke mountains, peninsula, koryak mountains

Question 12

how are fold mountains formed?

Answer 12

at a collision margin, two continental crusts move together causing sedimentary rock to be forced up between them in turn forming fold mountains.

Question 13

what is an ocean trench

Answer 13

a trench formed at a destructive boundary at the point where the oceanic crust gets sub ducted.