Download Volcano Week 1 PPT

Volcano Notes
Ms. Graham and Miss McGee
6th Grade Earth Science
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Week 1
November 30 to December 4
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Wk. 1 Day 1
• Before: Volcano Pre-Test
• During: Notes form PPT
• Exit slip:
– Name the 3 locations that volcanoes are found.
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Individual Volcanoes
- Locations
• Subduction Zones:
– Association between volcanoes & subduction zones.
– Ring of Fire = Ring of Subduction Zones
• Continental Rift Zone:
– A few volcanoes are associated with rift zones.
– e.g. Kilimanjaro & others in east African rift.
• Hot Spots:
– Some coincide with plate boundaries, most don’t.
– e.g. Hawaii
– Galapagos Is., Iceland, Yellowstone.
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Where are volcanoes located? Is there a pattern?
AT PLATE BOUNDARIES
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Patterns:
• Not random
• Linear
• Around large inactive plates
• Near areas where elevation is
changing
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Ring of Fire
There are currently about 1500 active
volcanoes around the world
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The Ring of Fire
• The Ring of Fire is an area in the basin of the
Pacific Ocean where a large number of
earthquakes and volcanic eruptions occur.
• The Ring of Fire is a direct result of plate
tectonics and the movement and collisions of
lithospheric plates.
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Wk. 1 Day 2
• Before: Question of the Day
– Where is the Ring of Fire located?
• Open with Volcanoes by Jimmy Buffett
• https://www.youtube.com/watch?v=IjGHwGk
FIFw
• Notes
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Volcanoes
Dormant (still has seismic activity and lava flow)
**Not currently erupting (but still could
anytime)
Active
**Currently erupting
Extinct (no seismic activity, no magma flow)
**Not able to erupt (permanently)
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GLOSSARY
Bomb – a lump of rock thrown out in an eruption
Crater – a deep hollow at the top of a volcano
Eruption – the release of gases, magma and rock from a volcano
Lava – melted rock that flows down the volcano
Magma – melted rock inside the Earth
Molten – melted, liquid
Vent – a crack on the side of a volcano where magma can escape
Volcanoes
• How do volcanoes form?
– Deep inside the earth, heat and pressure cause
rock to melt and form magma
• Why is magma forced upward toward the
earth’s surface?
– Magma is less dense than the rock around it, so it
is forced upward towards the earth’s surface
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Volcanoes
• Where do volcanoes occur?
– Along plate boundaries and above hot spots AND
rift boundaries
• A hot part in the middle of the mantle that
melts rock that is then forced upward as
magma
– Hotspot
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Volcanoes
• An example of a volcanic area at divergent
plate boundaries
– Mid Atlantic Ridge
• An example of a volcano at convergent plate
boundaries
– Soufriere Hills Volcano
• (Montserrat, West Indies – 1995)
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Volcanoes
• Volcanic eruptions can be
– Explosive
– Violent
– Quiet
• What 3 factors control the style of a volcanic
eruption
– Water Vapor
– Amount of trapped gases
– Magma composition
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Volcanoes
• A volcanoes form depends on whether it is the
result of a QUIET or and EXPLOSIVE eruption
and whether it is made a silica-rich or silicapoor lava.
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Magma!
What is the difference between “lava” and
“magma”?
Magma is below ground and lava is above
ground.
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Wk. 1 Day 3
• Before: Question of the Day
– What are blocks of lava thrown out of erupting
volcanoes called?
• During: Study Jam
• “ Volcanoes”
• After: Exit Slip
•
Study Jam Quiz
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Wk. 1 Day 4
• Before: Question of the Day
– What is the difference between lava and magma?
• During : Review
» Mini-Q
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Wk. 1 Day 5
• Before: Question of the Day
– The form that a volcano takes depends on what
two things?
• During : Review
» Mini Test
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