Plate Tectonic

Question 1

Mantle

Answer 1

Layer of molten magma - plates float on the mantle

Convection move these plates away towards or alongside each other

Question 2

Layer of the eart

Answer 2

Inner core, outer core, mantle , crust

Question 3

Describe constructive margin

Answer 3

Convection current drag the plates apart
Edges of the plates pushed up by the convection currents to form ridges
Magma rises to fill the gap and solidifies to form new crust
Not large build of friction -> earthquake are only gentle
Volcanoes created

Question 4

Describe destructive margin

Answer 4

Oceanic and continental plate collide
Oceanic plate denser -> sinks under the other
It takes some sand, water and other material from the sea bed with it
These melt, creating fas which is force to go up the surface of volcanoes
Oceanic plate melts due to hear and friction -> rise a magma
Continental plate crumples at the edge creating fold mountains
Violent volcanoes and earthquake

Question 5

Describe collision margin

Answer 5

Convection current -> 2 continental plate pull together
Same material -> same density -> crumple up -> fold mountain -> force down -> mountain root
No volcanoes bc no plate is being destroyed
Earthquake due to massive build up of pressure and friction

Question 6

Conservative margin

Answer 6

Two continental plates move alongside
Not being force up or down -> no major landforms
Crust is not being destroyed -> no volcanoes
Huge build up of friction and pressure -> massive earthquake

Question 7

Why live near volcanoes

Answer 7

Fertile land for farming - lava breaks down -> most fertile soil on earth
Tourism
Unaware
Cheap land, cant afford to move
Resources: sulphur and other mineral can be mined
Family live here along time
Geothermal power along the plate edges - cheap and clean power
Beautiful landscape

Question 8

What is focus

Answer 8

The point inside the crust where the pressure is released

Question 9

Epicentre

Answer 9

Point on earth surface directly above focus

Question 10

Seismic wave

Answer 10

Spread out from the focus

Further, weaker

Question 11

Why live near earthquake

Answer 11

Poor - force to live here
Overpopulation
Live here all their life -> unwilling to move
Major one happen infrequently, prepare to take risk, dont think that 1 will occur in their time
Building improve, withstand strong earthquake
Geothermal power

Question 12

Define crust

Answer 12

Surface of the earth

Collection of solid tectonic plates that join together like a jigsaw puzzle