year7 exams: tectonics (volcanoes and earthquakes) revision
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Year7 exams: tectonics (volcanoes and earthquakes) revision. Key term revision:. Plate Plate boundary Vent Crater Magma Lava Richter scale Lahar MEDC LEDC Mt St Helens Nevada Del Ruiz San Francisco Base Insulator Emergency kit. What does this map show?. - PowerPoint PPT PresentationTRANSCRIPT
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Year7 exams: tectonics (volcanoes and earthquakes) revision
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Key term revision:Plate Plate boundaryVentCraterMagmaLavaRichter scaleLaharMEDC LEDCMt St HelensNevada Del RuizSan FranciscoBase InsulatorEmergency kit
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What does this map show?
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This map shows the plate boundaries again, and it also shows where wefind volcanoes. These are shown by red dots.
Is there a pattern that you can describe?
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All the dots and circles on this map show earthquakes. What do youthink the bigger circles show?
Can you see any links between this map and the last one?
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Now make sure that you answer the key questions:
1. Do earthquakes and volcanoes appear all over the earth’s surfaceor only in certain places?
2. Is there a recognisable pattern to where earthquakes seem to occur?3. Which areas of the earth seem to be at the highest risk from
earthquakes?
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We can take our understanding a little further. For example:
This plate boundary Moves in a different wayto this one
How…..?
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Now write down:
1. How the plates move.2. What happens when they move.
This is called a constructive plateboundary
At this plate boundary, the plates moveapart very slowly. This causes earthquakes.As they move, magma rises up, and if itreaches the surface it will form avolcano.
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This is called a destructive plateboundary
At this plate boundary, the plates movetogether very slowly. As they rubtogether this causes a lot of friction.Friction leads to earthquakes, and canalso cause volcanoes because of the heat.
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Sample exam question:
For 3 marks:Explain the relationship between earthquakes
and volcanoes
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Volcanoes:
What do these 3 key terms mean?
Active, Dormant, Extinct
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Volcanoes in MEDC and LEDC: what do we remember….
MEDC LEDC
name
Cause
Description of eruption
Description of effects
How people responded to it
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Sample questions
• For a volcano you have studied explain the impact it had on the people and the environment (6 marks)
• Explain why volcanoes are more deadly in LEDCs than MEDCS (4 marks)