Section 13-2 Review Page #330:1-9. #1 Summarize the difference between mafic and felsic magma. Mafic...
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Transcript of Section 13-2 Review Page #330:1-9. #1 Summarize the difference between mafic and felsic magma. Mafic...
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Section 13-2 ReviewSection 13-2 Review
Page #330:1-9Page #330:1-9
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#1#1
Summarize the difference between mafic
and felsic magma.
Mafic Magma magnesium & iron dark less viscous
Felsic Magma silica & feldspars light more viscous
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#2#2
Explain how the composition of magma
affects the force of volcanic eruptions.
More viscous magma traps gases more easily than less viscous magma, which may lead to more explosive eruptions.
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#3#3
Compare three major types of lava flows.
• Pahoehoe – ropy
• Aa – jagged
• Blocky Lava – large chunks
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PahoehoePahoehoe
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AaAa
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#4#4
Define pyroclastic material, and list three
examples.
Pyroclastic material consists of fragments of rock that form during an explosive eruption.
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Pyroclastic MaterialPyroclastic Materialvolcanic ash/dust
lapilli
volcanic bombs
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Volcanic AshVolcanic Ash
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BombBomb
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#5#5
Identify the three main types of volcanic cones.
shield volcano
cinder cones
composite volcano
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Types of VolcanoesTypes of Volcanoes
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Shield VolcanoShield Volcano
Mauna Loa - Hawaii
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Cinder ConeCinder Cone
http://video.google.com/videoplay?docid=5804326697533034741&q=cinder+cone+eruption&hl=en
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Composite VolcanoComposite Volcano
http://video.google.com/videoplay?docid=3977416382972126736&q=mt+st+helens+eruption&hl=en
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#6#6
Describe how calderas form.
A caldera forms when the magma chamber of a volcano empties, causing the volcanic cone to collapse in upon it, or when magma is ejected violently and the cone is destroyed.
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CalderaCaldera
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Crater LakeCrater Lake
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#7#7
List three events that may precede a
volcanic eruption.
earthquake activity
rock temperatures increase
volcano area bulges
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#8#8Would quiet eruptions or explosive eruptions be more likely to increase the steepness of a volcanic cone? Explain your answer.
Explosive eruption are more likely to increase volcano height, because the pyroclastic materials rise upward and fall close to the volcanic vent.
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#9#9
Why would a sudden increase of
earthquake activity around a volcano
indicate a possible eruption.
Sudden earthquake activity could be caused by magma moving upward through the rock around the volcano.
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The EndThe End
On “Io” a moon of Jupiter