1 How many layers of the Earth are there?

2 3

3 The part of the Earth that consists of molten metal

4 Outer core

5 The depth of the deepest mine in the world.

6 3.8 Km

7 What causes seismic waves?

8 earthquakes

9 Which metals make up the inner core?

10 Iron and nickel

11 Heat always moves …

12 From hot to cold

13 How heat is transferred in a fluid.

14 convection

15 Causes convection currents in the mantle.

16 Heat from the core and mantle

17 Convection currents are found in the mantle and …

18 Outer core

19 Convection currents within are thought to cause the Earths ….

20 Magnetic field

21 The part of the Earth that drifts.

22 crust

23 The trace of any organism preserved in rock

24 fossil

25 Mountain ranges in S. America line up with ranges on …

26 Africa

27 Supercontinent name.

28 Pangaea

29 Proposed the theory of continental drift.

30 Wegener

31 What surrounds the mantle?

32 crust

33 This boundary between the crust and mantle is hot plastic-like rock.

34 asthenosphere

35 Dark, fine grained igneous rock. Mostly found on the sea floor.

36 basalt

37 The border just above the asthenosphere.

38 lithosphere

39 Light colored, coarse grained rock that makes up most of the continents.

40 granite

41 Rock samples are a form of ______ evidence.

42 direct

43 Seismic waves are a form of ______ evidence.

44 indirect

45 Seismic waves revel the structure of the Earth through their speed and _____.

46 paths

47 Where the crust is thinnest.

48 Ocean floor

49 At what depth in the crust does the temperature start increasing?

50 20 meters