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Science > volcanlo and plate techtonics > Flashcards

volcanlo and plate techtonics Flashcards

1
Q

what comprises the lithosphere?

A

crust and upper most solid mantle.

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2
Q

what are the 3 main layers of the earth.

A

crust mantle and core

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3
Q

what is the theory of continental drift

A

that the continents used to be one big continent which slowly pulled apart

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4
Q

who came up wit he theory of continental drift

A

Alfred wegener

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5
Q

why was the theory of continental drift discarded?

A

there was no way to explain HOW the continents could move

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6
Q

what is the definition of geology

A

study of earth’s composition, structure and history

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7
Q

what is pangae

A

a supercontinent before continental drift

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8
Q

what happens at mid ocean ridges

A

new ocean crust forms

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9
Q

how do transform boundaries move

A

against

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10
Q

how do converging boundaries move

A

towards

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11
Q

how do diverging boundaries move

A

away

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12
Q

what are volcano explosions type determined by?

A

magma

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13
Q

what is a composite (stratovolcanoes)

A

explosive eruptions of lava and ash

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14
Q

what is a cinder cone volcano

A

steep sided volcano formed of ash and cinders

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15
Q

what is a batholith

A

largest intrusive igneous

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16
Q

what is a caldera

A

when the top of a volcano collapses and fills with water

17
Q

what is a normal fault

A

when the hanging wall drops

18
Q

reverse (thrust) fault

A

when the hanging wall goes up

19
Q

strike-slip fault

A

when they move apart

20
Q

sea floor spreading evidence

A

radioactive dating of rocks, magnetic reversals of the iron core, continental puzzles

21
Q

which wave travels faster. P or S?

A

p

22
Q

what do p waves travel through

A

liquids

23
Q

how do S waves travel

A

up and down

24
Q

what do S waves travel through

A

solid

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