Unit 1 Revision

Topic 1: Restless Earth

What are the main things I need to know?

• How and why tectonic plates are moving

• Why earthquakes and volcanoes occur

• 2 examples of earthquakes

• 2 examples of volcanoes

• How people can respond to earthquakes and volcanoes

Starter: Study this diagram for 30 seconds…

Now draw your own version in 1 minute

Explain why plates move (4)

Plate movement

Spend 5 minutes to sketch and label the following plate boundaries:

• Convergent (destructive)• Divergent (constructive)• Transform (conservative)• Convergent (collision)

Earthquake key words

Crust focus energy

Mantle pressure released

Plates heat plate boundary

Epicentre friction

Practice question:

• Explain why earthquakes occur (you can draw a diagram if you wish).

(4 marks)

(4 minutes)

SELF ASSESSMENT:Explain why earthquake occur

• For 4 marks need 4 points (or 2 points each explained)

Eg Convection currents in the mantle cause the plates to move and collide. Pressure can build up at the plate boundaries where plates are colliding because plates do not move easily past one another. When the rocks can no longer take the pressure, they crack, releasing shockwaves (the earthquake).

• Mind-map / create a flash card about all facts you know about the case studies:

Earthquake LEDC – Kashmir 2005

Earthquake MEDC – Loma Prieta, California

1989

Volcanic eruption LEDC – Montserrat 1997

Volcanic eruption MEDC – Iceland 2010

Case studies

Feedback

• Add more details to your flash cards / mind maps.

Practice question:

• Using examples, explain how people can respond to earthquakes. (4 marks)

SELF ASSESSMENT:Using examples, explain how people can

respond to earthquakes. (4 marks)• For 4 marks need 4 points (or 2 points each

explained)• In Japan, buildings are made to withstand

earthquakes such as being built with shockabsorbers in their foundations. Also, people are taught what to do if an earthquake strikes such as taking cover under a table or standing in a doorway. In Haiti lots of charities like the Red Cross helped out by providing tents for people to live in and medical help for people who were hurt.

VolcanoesMontserrat – LEDC example• 25th June 1997• On the boundary between the Caribbean and

Atlantic plates (destructive plate margin)

Montserrat Impacts – Which are primary and which are secondary?

• 2/3 island covered in ash• Airport has remained closed• 23 people killed• Over half the population left the island and have

not returned• Farmland destroyed by ash

How else could you categorise these impacts?

Icelandic Eruption – MEDC example – STUDY THIS INFORMATION FOR 30

SECONDS• March / April 2010

• Constructive plate boundary where Eurasian and North American plates move apart

• No deaths

• Ash affected farmland locally, flights in Europe, contaminated water sources.

• Increase in tourism locally

Monitoring Volcanoes

• We CAN predict and prepare for volcanic eruptions…