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geography > our restless planet > Flashcards

our restless planet Flashcards

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1
Q

what are the names of the four layers in the earth

A

inner core, outer core, mantle and crust

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2
Q

what are both inner and outer cores made out of

A

iron and nickel

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3
Q

how thick is the inner core

A

1200 km

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4
Q

how thick is the outer core

A

2200 km

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5
Q

how thick is the mantle

A

2900 km

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6
Q

how thick is the crust

A

about 35 km

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7
Q

there are two types of crust, name them

A

continental and oceanic

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8
Q

what is the continental crust mainly made out of

A

granite

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9
Q

what is the oceanic crust mainly made out of

A

basalt

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10
Q

what is a trench

A

small valleys or mountains on the ocean floor

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11
Q

what is an earthquake

A

the rock suddenly shifting

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12
Q

what is a volcano

A

the liquid rock bursting out through the earth’s hard surface

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13
Q

what is a lithosphere

A

the mix of curst and upper mantle

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14
Q

what is a convection current

A

the movement to change the form of the earth

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15
Q

what is a seismic wave

A

the energy stored when an earthquake is occuring

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16
Q

what is the focus

A

the point of where the earthquake happens

17
Q

what is an epicentre

A

the point above the epicentre on the crust

18
Q

what is a tsunami

A

the earthquake that is happening on the ocean floor causing the waves to go in different directions

19
Q

what are some damages a earthquake can do

A

land slide
fire homes
water mains sopen
tsunami

20
Q

what are the small earthquakes called after the main earthquake

A

aftershock

21
Q

what is a seismometer

A

a machine used to measure the earthquake in the wave form

22
Q

what is a magnitude

A

the amount of energy being released because of an earthquake

23
Q

when does the earthquake become alot more dangerous when it reaches a point

A

when it is at 5

24
Q

what is a richter scale

A

the scale used to specify of how the dangerous an earthquake is

25
Q

what does it mean when one goes up on the richter scale

A

10 times more of shaking and 30 more times of energy

geography (6 decks)

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