Plate Tectonic

Question 1

how is the crust divided

Answer 1

the crust is divided into several large pieces called plates
it is unstable because plates move
😊slowly

Question 2

name the way plates move

Answer 2

together destructive and collision
apart constructive
past each other conservative

Question 3

how many types of crust are there

Answer 3

2 continental and oceanic

Question 4

oceanic crust

Answer 4

5-10km thick
dense
sinks when is subducted by continental
oldest is 180 million years old
forms constantly at constructive plate boundaries
destroyed at destructive plate boundaries

Question 5

continental

Answer 5

25-100km 
less dense 
doesn't sink
very old 3-4billion years old 
no crust not form 
cannot be destroyed

Question 6

plate theories described the structure of the earth’s layers

Answer 6

inner core 
solid hot up to 5000oc
outer core 
liquid iron and nickel 
mantle 
soft molten rock about 3000oc nickel and iron 
crust
hard outer shell separated into plate margins

Question 7

what happens inside the earth

Answer 7

heat from core gives convection currents in the mantle
very slow
causes plates to move
causes earthquakes and volcanoes to set off

Question 8

magma

Answer 8

liquid rock

melted due to the earth’s core heat intensity

Question 9

where do earthquakes and volcanoes happen

Answer 9

around plate boundaries
causes by friction of two.plates
or.molten rock magma rising to the surface of earth

Question 10

why do earthquakes happen

Answer 10

occur due to stresses build up between the plates as one passes each other
plates are not smooth so they snag and grind each other allowing energy to.build up
when plates move seismic waves is released from energy

Question 11

what is the focus

Answer 11

the focus is the place is where the earthquake is occurring

Question 12

what is the epicentre

Answer 12

the epicentre is above on the surface of the earth where the epicentre resides

Question 13

what is a volcano

Answer 13

they are mountains that can explode with violent conquences

volcanoes are landforms that are from hot liquid magma bring forced up from the earth’s crust through a vent

Question 14

how many types of volcanoes are there

Answer 14

2

Question 15

what are composite volcanoes

Answer 15

found ate destructive plate boundaries
steep sided layers of ash and lava 
viscous magma 
cools quickly
very explosive

Question 16

shield volcanoes

Answer 16

found at constructive plate boundaries 
dome shape 
sloping sides 
runny magma flows a long distance 
gentle explosions

Question 17

destructive plate boundaries

Answer 17

oceanic meets continental moving towards each.

dense oceanic is subducted by continental
it melts and produces andesite

sinking plate can stick to continental,
pressure builds up against friction causing earthquakes
e.g Pacific and eurasian plates

Question 18

constructive plate margins

Answer 18

two oceanics plates move apart
new oceanic crust is created constantly in the gap as the magma cools
runny magma shield volcanoes
earthquakes due to friction as plates tear apart
n American and eurasian plates

Question 19

conservative plates

Answer 19

plates move by either in the same or different directions
slide pass each other causing friction earthquakes
no 🌋 volcanoes
Pacific and n American plates

Question 20

collision 💥

Answer 20

fold mountains are created
two continental plates moving towards each other
non of the plates sinks as they both have similar densities
plates buckle to form mountains e.g. himalayas
no volcano
indo-australian and eurasian plates

Question 21

primary effects of tectonic hazards

Answer 21

these are things that happen during the tectonic hazards sure such as :
buildings collapsing
injuries 
electricity and water supplies cutbacks
homelessness

Question 22

secondary effects of tectonic hazards

Answer 22

these are things that happen afterwards such as
fires
landslides
tsunamis