Plates Flashcards

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1
Q

What is a divergent plate boundary

A

Plates moving apart

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2
Q

What is a transform plate

A

Plates sliding past each other

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3
Q

What is ocean vs. ocean

A

Converging

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4
Q

What happens with ocean vs. ocean

A

Collision

Subduction

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5
Q

What does ocean vs. ocean cause

A

Island arcs

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6
Q

What is an example of an island arc

A

Japan

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7
Q

What is ocean vs. continent

A

Converging

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8
Q

What happens with ocean vs. continent

A

Subduction forming ocean trench

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9
Q

What does ocean vs. continent cause

A

Andes mountain range

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10
Q

What is continent vs. continent

A

Converging

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11
Q

What happens with continent vs. continent

A

Two plates collide

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12
Q

What does continent vs. continent create

A

Large mountains ranges

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13
Q

What is an example of continent vs. continent

A

Himalayas

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14
Q

What does converge =

A

Deconstructive

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15
Q

What does diverge =

A

Constructive

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16
Q

What does transform =

A

Conservative

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17
Q

What are tectonic plates made of

A

Lithosphere

18
Q

What do tectonic plates float on

A

Asthenosphere

19
Q

Who came up with the theory of continental drift

A

Alfred Wegener

20
Q

What year did he create his theory

A

1912

21
Q

What is a supercontinent

A

All continents formed as one

22
Q

What was the name of the supercontinent

A

Pangaea

23
Q

What was the sea surrounding Pangaea

A

Panthalassa

24
Q

How long ago did they break apart

A

200 million years

25
Q

What were the two subcontinents

A

Gondwanaland

Laurasia

26
Q

What was his evidence

A

The continents fit together

27
Q

What was the mesosaurus

A

South American/African
Water reptile
Fresh water only

28
Q

What was the lystrosaurus

A

Land reptile
African/Australia/India
Antarctica

29
Q

What is the cynognathus

A

Land reptile
Africa/ South America
Triassic period

30
Q

What is the glossopteris

A

Tropical tree

Gondwanaland

31
Q

What is the climate evidence

A

Evidence of glaciers

Evidence of tropical rainforest

32
Q

What happened to his theory

A

Rejected
Credited 50 years later
Moves because of convection current

33
Q

Who came up with sea floor spreading

A

Harry Hess

34
Q

What year did Hess come up with theory

A

1962

35
Q

How did he find his theory

A

Found cracks in mountains known as rifts

36
Q

What did he propose

A

New crust was forming and diverging

37
Q

What was his theory of Pangaea breaking

A

Large continent gets cracked
Gaps fill with water
Water becomes ocean
Continental crust keeps spreading

38
Q

What is the evidence

A

Sea floor ages

Magnetic striping

39
Q

What are sea floor ages

A

Oldest rocks away from rift

Symmetrical ages on both sides

40
Q

What is magnetic striping

A

Magnetites in sea floor get arranged to magnetic field