STRUCTURE OF EARTH Term 3

Question 1

The Structure of the earth consist/layered of

Answer 1

The earth is layered :

* Outer Solid Crust

* Mantle

* Liquid outer Core

* Solid Inner Core

Question 2

How can we understand the structure of the Earth?

Answer 2

* By observing Topography

* Rock formation

* Samples brough to the surface by volcanos

* experiments by scientists

Question 3

0 - 35 km __________

__________ 35 - 60 km

Answer 3

0-35km Crust

Upermost part of mantle 35 - 60 km

Question 4

? - ? km is the Mantle

In the Mantle is the 210 - 270 km ___________

660 - 2890 km _____________

Answer 4

35 - 2890 km is the Mantle

In the Mantle is the210 - 270 km Upper Mantle

660 - 2890 km Lower Mantle

Question 5

How many km down is the OUTER CORE

Answer 5

2890 - 5150 km

Question 6

How many kilometres down is the INNER CORE

Answer 6

5150 - 6360 km

Question 7

What are the 2 layers in the earths crust?

Answer 7

1. Oceanic Floor (Sima)

• Continuous thin layer around the earth
• Hard heavy igneous rock like basalt

2. Continental Crust (Sial)

• Not continuous but thicker
• Lighter rock made of silicate, like granite

Question 8

How thick is the earth crust?

Answer 8

0 - 35 km deep

Question 9

Where do we find the Crust

Answer 9

It is the outside layer of the earth

Question 10

What is the Sima

Answer 10

It is the thin parts of the oceanic crust

It is continuous layer around the earth

Question 11

What is the Sima (crust) made of?

Answer 11

Hard igneous rock like basalt

Question 12

What is the Sial?

Answer 12

It is the thicker continental crust on earthIt is not continuous

Question 13

What is the Sial made of

Answer 13

This layer is lighter and made of silicate rock like granite

Question 14

How old are most rocks on the earths crust?

Answer 14

less than 100 million yrs

Question 15

How old are the oldest minerals on earth? What does this indicate

Answer 15

4.4 Billion yrs

Indicates that earth has had a crust for 4.4 billion yrs

Question 16

How deep is the Mantle

Answer 16

Depth of 2890 km

Question 17

What is the thickest layer in the earth?

Answer 17

Mantle

Question 18

Mantle is divided in 2

name it and name what divides it

Answer 18

Upper Mantle

Lower Mantle

Divided by the Transition Zone

Question 19

What is the Mantle made of?

Answer 19

• Silicate rocks
• Rich in iron and magnesium
• Mostly solid but with high temp it cause a thick mass of flowing magma

Question 20

Is there a difference in the Upper and Lower Mantle

Answer 20

As you move deeper the pressure increases

The lower part is more denser than the Upper part

Question 21

Name the 2 parts of the core

Answer 21

• Solid inner Core - radius 1220 km
• Liquid outer core - radius 3400 km

Question 22

What is the inner core made of

Answer 22

Nickel and iron

Question 23

How did the core form 4.5 billions yrs ago

Answer 23

• Due to melting, denser substances sinked to the centre
• While less dense material migrated to crust

Question 24

What surrounds the inner core that’s made of nickel and iron and trace amounts of lighter elements

Answer 24

Liquid core

Question 25

What does the inner most part of the core contain / rich of

Answer 25

Gold, platinum