volcanoes 01/22/13. definition a volcano is an opening in a planet's crust, which allows hot...
TRANSCRIPT
Volcanoes 01/22/13
Definition
• A volcano is an opening in a planet's crust, which allows hot magma, volcanic ash and gases to escape from the magma chamber below the surface.
How do they form?• Volcanoes form often at plate boundaries.
Divergent Boundaries form a . - Mid-ocean Ridge; or- Rift Valley
Convergent BoundariesOceanic – Continental Oceanic - OceanicTrench Mid-Ocean Ridge
creating an island arcAndes Mountains Japan; Hawaii
How do they form?• 3) Hot Spots: columns of hot
magma rising from a thin spot in the Earth’s crust. As the plate moves, so does the column of lava, creating island chains.
• Real life Example: HAWAII
Types: (nope they aren’t all the same)• Shield, Cinder Cone and Composite volcanoes.
So what does it look like?• http://lavapix.com/#/page/video-volcano/
Shield Volcanoes• Shield volcanoes slowly erupt. They are large in size and don’t
make huge peaks, they are more like a gently sloping mountain where one layer of lava cools hardens and another layer flows on top. Ex: Hawaiian islands.
• Video: http://www.bing.com/videos/search?q=shield+volcano&view=detail&mid=258E9BE9D6A967D74421258E9BE9D6A967D74421&first=0&adlt=strict#view=detail&mid=D7D725889F4B649D733ED7D725889F4B649D733E
Shield Volcanoes - pictures
Cinder cone Volcanoes• Produces high viscosity lava with ash, cinders and bombs. • Explosive eruptions.• Form a cone like mountain.
Cinder cone volcanoes• Video: http://
www.bing.com/videos/search?q=cinder+cone+volcanoes&view=detail&mid=B8B605F2874028672739B8B605F2874028672739&first=0&adlt=strict#view=detail&mid=1CE981DEA3D53BF3F3061CE981DEA3D53BF3F306
Composite Volcanoes• Lava flows alternate with explosive eruptions of ash, cinder
and bombs. • They are tall, cone shaped mountains where layers of lava
alternate with layers of ash. • EX: Mt. Fuji, Mt. Saint Helens
• Video: http://www.bing.com/videos/search?q=composite+volcano+&view=detail&mid=2CDF551F7B6426E174912CDF551F7B6426E17491&first=0&adlt=strict#view=detail&mid=6B50410E72C30DFB3A2D6B50410E72C30DFB3A2D
Composite volcanoes (also called Stratovolcano)
• Quick Write: If you were building a new house by a volcano, which type of volcano would be best?
• Done? Get out P-9 and get ready to check over your answers. Then help me pass back!
• Agenda:• Warm Up• Check P-9 / Questions• Binder Organization / TOC• Hawaii Hot Spot Modeling Lab
Video – Bill Nye models a volcano• http://
www.bing.com/videos/search?q=bill+nye+volcanoes&view=detail&mid=309A88E252D326BA779F309A88E252D326BA779F&first=0&qpvt=bill+nye+volcanoes&adlt=strict#view=detail&mid=5ACAD5362B938E2822885ACAD5362B938E282288
Reading• Pages 91 – 105.
• Look at the pictures.• Use the diagrams.
Anatomy (the different parts and what geologists call it)
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