volcanoes. what do you know about volcanoes? what would you like to know?
TRANSCRIPT
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Volcanoes
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• What do you know about volcanoes?
• What would you like to know?
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Hawaii
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Volcanoes can be Active, Dormant or Extinct
Active
Dormant
Extinct
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vent
cone
magma chamber
Pipe
(Conduit)
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Cold Crust
Ocean
Hot Melt
Hot Mantle
CoolerMantle
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Volcanoes that erupt like yours are called Effusive or Shield volcanoes
The lava:• Is runny• The lava flows a long way• Has some bubbles• Forms volcanoes that are wider than they are tall
An example is:
Mauna Loa, Hawaii
Effusive volcanoes
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Explosive Volcanoes
We are now going to show you what an explosive volcano is like.Watch carefully and you will notice some differences in the way it erupts from the way your volcano erupted.
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USGS/Hawaiian Volcano ObservatoryPhoto by J.D. Griggs
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Activity
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magma magma
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Hawaii
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Courtesy of www.swisseduc.ch
Ash and rocks are thrown into the air
Thick lava flows
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RoughLots of pieces
Smooth or Ropy
Courtesy of A. Rust
Courtesy of A. Rust
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• We have brought along a collection of real volcanic rock from Bristol University for you to investigate
• Look carefully- • Can you see any bubbles in the rock?• Can you find any crystals?• Can you see anything that has melted in the lava?• Can you find a volcanic bomb?• Can you find some wiggly lava?
• We have brought along a few rocks that are not from Volcanoes- can you work out which ones they are?
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What is a volcano? Mountains that erupt .
A dormant volcano is: awake asleep ________ chamber
V____
Conduit
Cone
Why do volcanoes erupt? Hot magma wants to go: up down
How do volcanoes erupt? Two types: e and effusive
What helps make explosive volcanoes erupt? .
Do effusive volcanoes have runny or sticky lava? .
l a v a
x p l o s i v e
b u b b l e s
r u n n y
e n t
M a g m a
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