geography - volcanoes, earthquakes

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what are the layers of the earth?
crust, mantle, liquid outer core, solid inner core.
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how thick is the oceanic crust?
5km thick.
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where does magma come from?
the mantle.
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where is the hottest part of the earth?
inner core.
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what do convection currents do inside the mantle?
they cause the mantle to flow causing plate movement. then when the plates meet earthquakes and volcanoes can occur.
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how much does the mid atlantic ridge move per year?
6cm.
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what can prove that the the atlantic ocean is getting wider?
telephone cables in the ocean have broken and south america and Africa look like they once fitted together.
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what plate is Britain on?
what plate is Britain on?
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give some examples of where earthquakes happen.
California and japan
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how are volcanoes formed?
1) the plates move towards each other 2) they then rub together 3) the friction melts the rock 4) the molten rock rises 5) volcanoes erupt on the surface
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what is it called where plates meet?
a plate boundary.
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what is it called when plates move apart?
a constructive boundary
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what is it called when plates move together?
a destructive boundary
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what is it called when plates slide past each other?
a conservative boundary
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give some primary effects of an earthquake.
buildings collapse, debris falls, gas cookers set a light, water and electricity supplies are cut
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give some secondary effects of an earthquake.
roads are destroyed meaning emergency services can't get through, tsunamis come crashing, no fresh water causing disease, air rushing into fire causing fire storms
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richter scale 1-2
detected by seismometers
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richter scale 4
moderate vibration movement of loose objects
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richter scale 5
windows shatter objects fall, strong vibrations
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richter scale 6
damage to buildings walls crack and chimneys fall
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richter scale 7
disaster. ground cracks, pipes break and buildings collapse possible landslides
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Other cards in this set

Card 2

Front

how thick is the oceanic crust?

Back

5km thick.

Card 3

Front

where does magma come from?

Back

Preview of the front of card 3

Card 4

Front

where is the hottest part of the earth?

Back

Preview of the front of card 4

Card 5

Front

what do convection currents do inside the mantle?

Back

Preview of the front of card 5
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