STRUCTURE OF EARTH Term 3 Flashcards Preview

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Flashcards in STRUCTURE OF EARTH Term 3 Deck (25):
1

The Structure of the earth consist/layered of

The earth is layered :

* Outer Solid Crust

* Mantle

* Liquid outer Core

* Solid Inner Core

2

How can we understand the structure of the Earth?

* By observing Topography

* Rock formation

* Samples brough to the surface by volcanos

* experiments by scientists   

3

0 - 35 km __________

__________  35 - 60 km 

0-35km Crust 

Upermost part of mantle   35 - 60 km 

4

? - ? km is the Mantle

In the Mantle is the 210 - 270 km ___________

660 - 2890 km _____________

35 - 2890 km is the Mantle

In the Mantle is the210 - 270 km Upper Mantle

660 - 2890 km Lower Mantle

5

How many km down is the OUTER CORE

2890 - 5150 km

6

How many kilometres down is the INNER CORE

5150 - 6360 km

7

What are the 2 layers in the earths crust?

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

8

How thick is the earth crust?

0 - 35 km deep

9

Where do we find the Crust

It is the outside layer of the earth

10

What is the Sima

It is the thin parts of the oceanic crust

It is continuous layer around the earth

11

What is the Sima (crust) made of?

Hard igneous rock like basalt

12

What is the Sial?

It is the thicker continental crust on earthIt is not continuous

13

What is the Sial made of

This layer is lighter and made of silicate rock like granite

14

How old are most rocks on the earths crust?

less than 100 million yrs

15

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

4.4 Billion yrs

Indicates that earth has had a crust for 4.4 billion yrs

16

How deep is the Mantle

 Depth of 2890 km

17

What is the thickest layer in the earth?

Mantle

18

Mantle is divided in 2

name it and name what divides it

Upper Mantle

Lower Mantle

Divided by the Transition Zone

19

What is the Mantle made of?

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

20

Is there a difference in the Upper and Lower Mantle

As you move deeper the pressure increases

The lower part is more denser than the Upper part

21

Name the 2 parts of the core

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

22

What is the inner core made of

Nickel and iron

23

How did the core form 4.5 billions yrs ago

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

24

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

Liquid core

25

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

Gold, platinum