Types of volcanic eruption

2

How do they form?This one is forming on a destructive plate

• As the oceanic crust slips beneath the continental plate, some of the magma gets trapped above.

• This is force out through any crack it can find in the continental plate.

• Violà – you have a volcano!

3

Shield Volcanoes• Broad, slightly domed-

shaped• Made of layers of frozen

lava• May be 100s of km

across and have a large crater

• Produced by mild eruptions of large volumes of lava

• Non-explosive eruptions• Mauna Loa on Hawaii is a

good example

photo 1

What is happening in this photo? What is odd about this volcano? What could happen to all the snow and ice on this mountain?Write a description using your words and the volcano words from the side of the photo.

CraterEruptionSummit

photo 2

lava

Is this scene inside or outside of a volcano? What is happening to the lava? How long will it take to cool down? Why is there smoke or steam in the photo?Write a description using your words and the volcano words from the side of the photo.

photo 3EruptionAshDisasterEvacuation

How deep is the ash in this photo?What effect might it have had on the people living here?Few people died in this eruption but it is still a disaster. Why?Write a description using your words and the volcano words from the side of the photo.

The island of Montserrat in the Caribbean.

photo 4

Lava flow

As the lava flow moves across the land……??????Does it destroy everything it touches? Why?Is there any way that humans can stop the lava flow? How?Write a description using your words and the volcano words from the side of the photo.

11

Homework

• Choose an active volcano (or at least one that has erupted in the last 20 years or so)

• Find out its name and where it is – I will send you a world map to move a X to the right spot.

• Find out which sort of volcano it is – shield, composite or cinder cone

• Find out 4 other things about it

12

Suggestions for your other 4 things

• A picture of your volcano• Geographic setting:

– Is it on an island or in a mountain range? – Is it near towns or cities or is it isolated

• When did your volcano last erupt? – what do you know about it?– Was the eruption hazardous to people? What happened?

• If the volcano erupts again, what are the possible hazards? Does it pose a threat now?

• What are 2 cool facts about your volcano?• What is a question you still have about your volcano?