Earth Structure

Question 1

What is inside the earth?

Answer 1

Layers of rock

Question 2

How do we know

Answer 2

Humans have drilled 15km of the 6370km into the ground

Question 3

How else do we know

Answer 3

Seismic waves transfer energy through the crust

Question 4

What are P-waves

Answer 4

Longitudinal

Goes through solids and liquids

Question 5

What are s-waves

Answer 5

Transverse

Goes through solids only

Question 6

What does an increase in speed mean

Answer 6

Increase in density

Question 7

What are the layers of earth

Answer 7

Crust
Mantle
Outer core
Inner core

Question 8

How do the layers fit

Answer 8

Core is metal
Dense materials in centre
Light materials on top

Question 9

What is the crust divided into

Answer 9

Oceanic

Continental

Question 10

How deep is oceanic

Answer 10

8km

Question 11

How deep is continental

Answer 11

32km

Question 12

What is the temperature of crust

Answer 12

22*C

Question 13

What is the crust broken into

Answer 13

Tectonic plates

Question 14

What is the oceanic crust made of

Answer 14

Iron
Oxygen
Silicon
Magnesium
Aluminium

Question 15

What is the continental crust made of

Answer 15

Granite

Sedimentary rocks

Question 16

What is the mantle

Answer 16

Hot dense rock

Question 17

What is the temperature of the mantle

Answer 17

1400* - 3000*

Question 18

What is the depth of the upper mantle

Answer 18

670km

Question 19

What is the upper mantle made of

Answer 19

Iron
Oxygen
Silicon
Magnesium
Aluminium

Question 20

What is the temperature of the lower mantle

Answer 20

3000*

Question 21

What is the lower mantle

Answer 21

Solid

Question 22

How deep is the lower mantle

Answer 22

2890km

Question 23

What is the upper mantle

Answer 23

Solids and liquids

Question 24

What is the core

Answer 24

Centre of the earth

Question 25

What is the outer core

Answer 25

Liquid

Question 26

What is the inner core

Answer 26

Solid

Question 27

What is the outer core made of

Answer 27

Iron Nickel Sulphur Oxygen

Question 28

What is the temperature of the outer core

Answer 28

4000* - 6000*

Question 29

How deep is the inner core

Answer 29

5150km

Question 30

What is the inner core made of

Answer 30

Iron | Nickel

Question 31

What is the crust and upper mantle made of

Answer 31

Lithosphere

Question 32

What's the upper mantle plastic made of

Answer 32

Asthenosphere

Question 33

What is the lower mantle made of

Answer 33

Mesosphere