Unit 2

Question 1

what are plate tectonics

Answer 1

Plates
- are large slabs of rock that cover the earth’s crust
- The earth is made up of mantle,crust and the core

Question 2

Why do plates move

Answer 2

1. heat escapes from the core heating up the mantle
2. the heat generates convection’s currents
3. convection currents help to move the plates

Question 3

what are the three types of plate movement

Answer 3

divergent, convergent and transform

Question 4

Plate movement

Answer 4

there are only three directions of plate movement

Question 5

Divergent

Answer 5

plates that move away from each other

(map of the world’s volcanoes occur along divergent plate boundaries)

Question 6

Convergent

Answer 6

come together/plates that move towards each other

Question 7

Transform

Answer 7

slide past/ plates that move past each other

Question 8

layers of the earth

Answer 8

-crust
-mantle
-core

Question 9

Crust (lithosphere)

Answer 9

its lightest, most buoyant rock layer.
-thin and brittle

Question 10

Mantle

Answer 10

the thick zone of magma beneath the earth’s lithosphere is known as the mantle
-hot and molten

Question 11

Core

Answer 11

-the dense middle section of the earth is the core
-outer core
-very hot and dense
-approx.3000-4000°

Question 12

Measuring Earthquakes

Answer 12

magnitude-a number that describes size of an earthquake
seismograph-on instrument that responds to and records ground motion

Question 13

weak seismograph

Answer 13

have smaller squiggles

Question 14

strong seismograph

Answer 14

have bigger squiggles

Question 15

the science of earthquakes

Answer 15

-hypocentre
-epicentre
-foreshock
-aftershock
-mainshock
-plate boundary

Question 16

hypocentre

Answer 16

the location below the earth’s surface is where the earthquakes starts

Question 17

epicentre

Answer 17

the location directly above the hypocentre on the earth’s surface

Question 18

foreshock

Answer 18

these are smaller earthquakes that happen in the same place as the larger earthquake that follows

Question 19

mainshock

Answer 19

the largest main earthquake,and they usually have earthquakes that follow.

Question 20

plate boundary

Answer 20

the edges of plate tectonics