Year7 exams: tectonics (volcanoes and earthquakes) revision

Key term revision:Plate Plate boundaryVentCraterMagmaLavaRichter scaleLaharMEDC LEDCMt St HelensNevada Del RuizSan FranciscoBase InsulatorEmergency kit

What does this map show?

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?

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?

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?

We can take our understanding a little further. For example:

This plate boundary Moves in a different wayto this one

How…..?

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.

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.

Sample exam question:

For 3 marks:Explain the relationship between earthquakes

and volcanoes

Volcanoes:

What do these 3 key terms mean?

Active, Dormant, Extinct

Volcanoes in MEDC and LEDC: what do we remember….

MEDC LEDC

name

Cause

Description of eruption

Description of effects

How people responded to it

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)