Transcript
Page 1: Yr9 Revision Powerpoint

Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

REVISION FOR YEAR 9 VOLCANO EXAM

ST IVO SCHOOL GEOGRAPHY DEPARTMENT

Photos Courtesy of www.geographyphotos.com & R Chambers

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Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

Structure Of The Earth

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Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

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Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

Constructive Plate Boundary

At a constructive plate boundary, two plates move apart. As the two plates move apart, magma rises up to fill the gap. This causes volcanoes at this type of boundary. However, since the magma can escape easily at the surface the volcano does not erupt with much force.

E.g. Mid-Atlantic Ridge.

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Year 9 Geography Revision

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A destructive plate boundary is found where a continental plate meets an oceanic plate.

The oceanic plate subducts (sinks) under the continental plate because it is denser. Friction melts the plates. This melted plate is now hot, magma. If it reaches the surface, the liquid rock forms a volcano.

E.g. Nazca and South American Plate

Destructive Plate Boundary

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Year 9 Geography Revision

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Conservative plate boundaries exist where two plates slide past each.

No volcanoes are found along these plate boundaries, but earthquakes do occur.

E.g. San Andreas Fault, San Francisco

Conservative Boundary

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Collision boundaries occur when 2 continental plates move together. This causes the material between them to buckle and rise up, forming fold mountains.

E.g. Himalayas

Collision Boundary

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Year 9 Geography Revision

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STRUCTURE OF A VOLCANO

Crater

Magma Chamber

Vent

Secondary Cone

Lava Flow

Steam, Ash, Gas

Volcanic Bombs

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Year 9 Geography Revision

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Fertile Soil Scientific Research

Geothermal EnergyMinerals

Tourism

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Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

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Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

Page 12: Yr9 Revision Powerpoint

Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

Page 13: Yr9 Revision Powerpoint

Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

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Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

• Montserrat is found in the Caribbean and is part of the Leeward Islands.

• It is part of a island arc and was formed by volcanic eruptions.

North American Plate

Montserrat Case Study

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After 2 years of rumbling a huge eruption occurred on July 25 1997.

In July 1995 the dormant volcano of Soufriére Hills started to rumble back to life.

Montserrat is a Caribbean island famous for beautiful beaches and sea.

Background Information

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Underneath Montserrat the North American plate is slowly being forced under the Caribbean plate.

The lava was thick and it built up at the top of the volcano in a dome until it collapsed.

The Soufrière Hills Volcano produces a thick sticky lava.

Montserrat is situated on a destructive plate boundary.

Causes of the Eruption

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Airport was evacuated and closed.

A total of at least 4 square kilometres of land was covered by the pyroclastic flows and surges.

People evacuated to the north of the island.

Capital City (Plymouth) almost totally destroyed and evacuated.

19 people killed and many more injured.

Destroyed between 100 -150 houses.

About 8000 residents left the island to live somewhere safer.

Rich farmland destroyed by mudflows and covered by layers of ash.

The southern part of the island is off limits and people are fined if they are found there.

Effects of the Eruption

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Year 9 Geography Revision

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INSTRUCTIONS

There are 10 questions for you to have a go at – as you work through the slides, write

down the number of the question and your answer.

At the end of the 10 questions – there are slides with the correct answers on for you to check your answers – GOOD LUCK!

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Year 9 Geography Revision

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Question 1.

Which of the following is an example of a volcanic eruption?

a. Montserrat – 1997

b. San Francisco – 1989

c. Kobe – 1995

d. Tokyo - 1919

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Question 2.

Montserrat occurred at a..

a. destructive boundary

b. constructive boundary

c. collision boundary

d. conservative boundary

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Year 9 Geography Revision

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Question 3.

Re-arrange the following to give the correct order explaining the eruption of a volcano

a. friction between plates and heat from the earth causes melting of the oceanic plate

b. two plates move towards each other

c. subduction of the lighter oceanic plate occurs

d. molten magma rises and erupts

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Year 9 Geography Revision

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Question 4.

A constructive boundary is..

a. where two plates move side by side

b. where two plates move together

c. where two plates move away from each other.

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Question 5.

A collision boundary is where

a. an oceanic and a continental plate meet

b. two continental plates meet

c. two oceanic plates meet

d. two plates move away from each other

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Question 6.

At this boundary two plate move apart from each other

a. collision boundary

b. constructive boundary

c. destructive boundary

d. conservative boundary

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Year 9 Geography Revision

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Question 7.

At this boundary two plates of continental crust meet

a. collision boundary

b. constructive boundary

c. conservative boundary

d. destructive boundary

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Question 8.

Here an oceanic and continental plate move together..

a. destructive Boundary

b. constructive boundary

c. conservative boundary

d. collision boundary

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Year 9 Geography Revision

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Question 9.

The outer layer of the earth is called the..

a. crust

b. mantle

c. core

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Question 10.

This process occurs where two plates meet together..

a. precipitation

b. subduction

c. transpiration

d. divergence

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Year 9 Geography Revision

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Question 1.

Which of the following is an example of a volcanic eruption?

a. Montserrat – 1991

b. San Francisco – 1989

c. Kobe – 1995

d. Tokyo - 1919

Answers Slide

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Question 2.

Montserrat occurred at a..

a. destructive boundary

b. constructive boundary

c. collision boundary

d. conservative boundary

Answers Slide

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Year 9 Geography Revision

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Question 3.

Re-arrange the following to give the correct order explaining the eruption of a volcano

a. friction between plates and heat from the earth causes melting of the oceanic plate

b. two plates move towards each other

c. subduction of the lighter oceanic plate occurs

d. molten magma rises and erupts

Answers Slide

3

1

2

4

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Question 4.

A constructive boundary is..

a. where two plates move side by side

b. where two plates move together

c. where two plates move away from each other.

Answers Slide

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Question 5.

A collision boundary is where

a. an oceanic and a continental plate meet

b. two continental plates meet

c. two oceanic plates meet

d. two plates move away from each other

Answers Slide

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Year 9 Geography Revision

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Question 6.

At this boundary two plate move apart from each other

a. collision boundary

b. constructive boundary

c. destructive boundary

d. conservative boundary

Answers Slide

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Year 9 Geography Revision

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Question 7.

At this boundary two plates of continental crust meet

a. collision boundary

b. constructive boundary

c. conservative boundary

d. destructive boundary

Answers Slide

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Year 9 Geography Revision

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Question 8.

Here an oceanic and continental plate move together..

a. destructive Boundary

b. constructive boundary

c. conservative boundary

d. collision boundary

Answers Slide

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Year 9 Geography Revision

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Question 9.

The outer layer of the earth is called the..

a. crust

b. mantle

c. core

Answers Slide

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Year 9 Geography Revision

St Ivo School Geography Department www.geobytes.org.uk

Question 10.

This process occurs where two plates meet together..

a. precipitation

b. subduction

c. transpiration

d. divergence

Answers Slide


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