Earthquakes And Volcanos Flashcards

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1
Q

What is the inner core

A

Centre, hottest part of earth, iron nd nickel, 5500°c

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2
Q

What is the outer core

A

Surrounding the inner core, liquid layer made of iron nd nickel, similar temperatures

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3
Q

The mantle is??

A

Widest section of the earth , thickness of approx 2900 km. made from magma

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4
Q

The crust is

A

The outer layer , thin 0-60 km thick .

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5
Q

What is a constructive plate movement

A

Convection currents cause plates to move away from each other which can lead to volcanos

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6
Q

What is a destructive plate movement

A

When one plate is forced downwards beneath another

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7
Q

What is collisional plate movements

A

Two plates consisting of continental crust move together , it’s pushed upwards

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8
Q

What is conservative plate movements

A

where plates slide past each other in opposite directions, or in the same direction but at different speeds. Friction is eventually overcome and the plates slip past in a sudden movement. The shockwaves created produce an earthquake .

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9
Q

Describe the distribution

A

Plate boundaries particularly pacific plate

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10
Q

Example of conservative

A

San Andreas Fault, where the North American and Pacific plates are actually moving in the same direction, but at a different speed.

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11
Q

Example of destructive

A

Pacific plate moves towards Eurasian plate, Eurasian plate is bent

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12
Q

Positives of an eruption?

A

Provides valuable nutrients and good soil , high level of heat can provide geothermal energy attracts tourists

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13
Q

Monitoring a volcano

A

Seismometers as hundreds of small earthquakes r caused due to the magma rising

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14
Q

Causes of Japanese earthquake

A
A mag 9 earthquake 
Pacific plate nd Eurasian plate hadn’t moved in 200 years finally flicked up , sent water upwards 
Lasted 5 mins 
10 billion tons of water 
Also liquefaction
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15
Q

Effects

A

20,000 dead or missing
590,000 in shelters
1.4 mill left without drinking water

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16
Q

Responses

A

Built bigger better earthquake proof buildings

Upgraded warning systems