2 interior of the earth

Question 1

what gave earth a layered structure?

Answer 1

light things float, heavy things sink

Question 2

whats the top layer

Answer 2

crust

Question 3

what is the crust divided into?

Answer 3

huge plates that are constantly in motion

Question 4

how do earthquakes occur

Answer 4

when the plates grind against each other

Question 5

how do mountains form

Answer 5

when the plates collide

Question 6

how do deep trenches form?

Answer 6

when one plate slides under/away from another

Question 7

what is plate tectonics

Answer 7

the theory explaining the motion of these plates

Question 8

whats the layer under the crust

Answer 8

mantle

Question 9

what is the mantle composed of

Answer 9

solid, semi-solid and magma

Question 10

how is the mantle in constant motion?

Answer 10

heating and cooling of the mantle (convection currents)

Question 11

when do volcanoes erupt?

Answer 11

when the mantle pushes through the crust

Question 12

what are the layers underneath the mantle?

Answer 12

outer core and inner core

Question 13

what’s the outer core made of?

Answer 13

liquid metal

Question 14

what’s the inner core made of?

Answer 14

solid iron

Question 15

is the core in constant motion?

Answer 15

yes

Question 16

what is responsible for the earth’s magnetic field?

Answer 16

the inner core and outer core spinning at different speeds

Question 17

what can be used to study the inside of the earth?

Answer 17

dynamite shockwaves, earthquakes

Question 18

what are seismic waves caused by?

Answer 18

earthquakes

Question 19

how do seismic waves travel?

Answer 19

through the earth in different ways

Question 20

where can seismic waves be detected?

Answer 20

all over the globe

Question 21

what can be used to estimate the structure inside the earth?

Answer 21

different speeds and arrival times