tectonic plates/ plate boundaries

Question 1

what are the 4 layers of the earth

Answer 1

inner core, outer core ,mantle crust

Question 2

what is the lithosphere

Answer 2

the outer layer of the earth consisting of the crust and upper mantle

Question 3

what is the inner core made out of

Answer 3

solid, iron and nickel

Question 4

what state if the outer core

Answer 4

liquid

Question 5

what is the mantle

Answer 5

semi- molten rock that moves very slowly

Question 6

how hot is the inner core

Answer 6

up to 6000 degrees Celsius

Question 7

how thick is the crust

Answer 7

10-70km

Question 8

plates are made of 2 types of crust, what are the 2 types of crust

Answer 8

continental and oceanic crust

Question 9

what is the difference between the continental and oceanic crust

Answer 9

continental -thicker and less dense
oceanic- thinner and more dense

Question 10

why do tectonic plates move

Answer 10

due to convection currents in the mantle

Question 11

what are convection currents

Answer 11

flows of heat rising from the earth’s core, spreading, cooling and sinking again

Question 12

how do convection currents form

Answer 12

1. lower parts of the mantle heat up and rise ( becoming less dense)
   2.as they move to the top of the mantle, they cool down, then slowly sink (becoming more dense)
2. circular motions- convection currents, which cause plates to move

Question 13

what are the places where tectonic plates meet called

Answer 13

plate boundries

Question 14

what are the 4 types of plate boundaries

Answer 14

constructive, destructive, collision, conservative

Question 15

what is a destructive plate boundary

Answer 15

2 plates move towards each other

oceanic plate meets a continental plate

Question 16

what happens at a destructive plate boundary

Answer 16

the denser oceanic plate is forced down into the mantle and destroyed , often creating a volcano

Question 17

what is a constructive plate boundary

Answer 17

2 plates move away from each other

Question 18

what happens at the constructive plate boundary

Answer 18

magma rises from the mantle to fill the gap and cools, creating a new crust

Question 19

what is a collision plate boundary

Answer 19

both plates are made from continental crust and move towards each other

Question 20

what happens at a collision plate boundary

Answer 20

both plates are forced upwards, creating fold mountains

Question 21

how is the Himalayas formed

Answer 21

Eurasian and Indian plate collided

Question 22

what is a conservative plate boundary

Answer 22

2 plates slide past each other

same direction, different speeds

Question 23

what happens at a conservative plate boundary

Answer 23

friction between plates build stresses and trigger shallow- focus earthquakes when they slip

Question 24

why are there no volcanos at conservative plate boundaries

Answer 24

there’s no magma

Question 25

what is the atmosphere

Answer 25

the layer of gasses above the earth's surface

Question 26

what is a hotspot

Answer 26

places where the magma rises through the mantle and forces through crust, creating a volcano

Question 27

state the type of tectonic plate margin where subduction happens

Answer 27

destructive