Year7 exams: tectonics (volcanoes and earthquakes) revision.

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Presentation transcript:

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?

This map shows the plate boundaries again, and it also shows where we find 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 you think 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 surface or 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 way to this one How…..?

Now write down: 1.How the plates move. 2.What happens when they move. This is called a constructive plate boundary At this plate boundary, the plates move apart very slowly. This causes earthquakes. As they move, magma rises up, and if it reaches the surface it will form a volcano.

This is called a destructive plate boundary At this plate boundary, the plates move together very slowly. As they rub together this causes a lot of friction. Friction leads to earthquakes, and can also 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…. MEDCLEDC 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)