volcanoes are hot stuff!
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Volcanoes are Hot Stuff!. Created & Adapted by: Dawn Easley. VOLCANOES. EQ : What are the types of volcanoes and how are they formed?. So, What Is a Volcano?. A volcano is a weak spot in the crust where molten material, or magma, comes to the surface. - PowerPoint PPT PresentationTRANSCRIPT
Volcanoes are
Hot Stuff!
Created & Adapted by: Dawn Easley
VOLCANOES
EQ: What are the types of volcanoes and how are
they formed?
•A volcano is a weak spot in the crust where molten material, or magma, comes to the surface.
So, What Is a Volcano?
Where are the Volcanoes?
The Ring of FireSubduction zones
The Ring of Fire is a volcano belt formed by many volcanoes that border the Pacific Ocean.
The Ring of Fire**Click on picture for video.
How are volcanoes formed?
Deep in the earth it is very hot and rocks melt. The melted
rock is called magma and is lighter than the rocks around it so it rises. Sometimes it finds a crack or hole in the earth’s crust
and bursts through it (vent). This is how a
volcano begins.
Why do volcanoes
erupt?
Pressure builds deep in the earth where the magma is. Suddenly the gases escape and violently explode.
It’s a Volcano!Look up, there’s a fire burning!
Way up, in a mountain high.Look up, when there’s steam,
smoke, or ashes. When the crater starts to blow.
And the lava starts to flow. Then you will surely know.
It’s a volcano! It’s a volcano!
Look down, in the earth’s deep zoneWay down, under the soil & rock.
You’ll find that there’s magma burning.Pushing up through the plates
in the rock crust.Trying to start a fireworks show.And when the lava starts to flow.
It’s a volcano! It’s a volcano!
Nature’s always changing everything we see.
Always rearranging under the land and in the sea.
It’s a volcano! It’s a volcano!
Three kinds of volcanoes can happen
Composite, Shield, or Cinder Cone.
But when the earth starts shaking
And the lava starts to flow.It doesn’t matter which one
blows.For then you will surely know.It’s a volcano! It’s a volcano!
What are the different kinds of
volcanoes?
Classifying Volcanoes• Composite or
Strato • Cinder Cone • Shield
• Active • Intermittent • Dormant • Extinct
VOLCANIC ACTIVITYACTIVE - A volcano that has erupted in the recent past and is expected to erupt again.
INTERMITTENT – A volcano that erupts in fairly regular time periods.
DORMANT - A “sleeping” volcano. A volcano that has not erupted in the recent past, but could erupt again.
EXTINCT - A volcano that is not expected to erupt again.
ShieldVolcanoes
Volcanoes that build up from
many slow, steady, flows of hot lava are
called shield volcanoes. This kind of volcano is
low and broad with gently sloping sides.
They look like a warrior’s shield.
Shield Volcanoes• A shield volcano is a large,
gently sloped volcano made up from many slow, steady flows of hot lava. Low and broad – like a warrior’s shield.
• Materials Erupted: mainly liquid lava, so the volcano is made of layers of hardened lava.– Non-explosive eruptions
• Example: the volcanoes of Hawaii
**Click picture for video.
Cinder Cone Volcanoes
Cinder cone volcanoes form when solid rock and ash shoot up into the air and fall back around the volcano
opening. The cinder cone volcano has
steeply sloped sides.
Cinder Cone Volcanoes• A cinder cone volcano is a
relatively small, volcano with steep sides. It is where rock and ash shoot up into the air and fall back around the opening.
• Materials Erupted: small pieces of hardened lava (rock fragments) - called cinders– Moderately explosive
• Example: Paricutin (Mexico)**Click picture for video.
Composite or Stratovolcanoes
Stratovolcanoes, also called composite
volcanoes, erupt with molten lava, solid rock,
and ash. The layers pile up much like layers of cake and frosting. The layers form into
symmetrical cones, and the slopes are steep.
Composite Volcanoes• A composite volcano is a
huge mountain-like volcano. Layers build up like frosting on a cake forming a cone with steep sides.
• Materials Erupted: sometimes lava, sometimes rock fragments.– May have very explosive
eruptions
• Example: Mount St. Helens
**Click picture for video.
Volcano ResearchYou will be assigned a volcano to research. Each volcano has something interesting and unique about it - find out what it is!For each volcano you will be researching
*Where is the volcano located ?*When did the famous eruption occurred?*What type of volcano it is?*What is unique or interesting about the
volcano?*Is the volcano active, dormant or extinct?
**Some helpful websites are listed on the next slide . . .
Volcano World
U.S. Geological Survey - volcano page
Info. on Mount St. Helens
Info. on Mount Rainier
Volcanoes Listed by Name
Hawaii VolcanoesSmithsonian Volcano PageVolcanoes Live
Encarta (type in volcano name)
Encyclopedia.com (type in volcano name)
Try these sites to get your research started:
Pictures, Images, and information From:Soames Summerhays/Photo Researchers, Inc.
Kraft-Explorer/Photo Researchers Inc.Masao Hayashi-Dung/Photo Researchers Inc.
Why Do Volcanoes Blow Their Tops? By Melvin and Gilda Berger
www.usgs.gov/education/learnweb/volcano/index.html