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Section 13-2 Review Page #330:1-9
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#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 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 Compare three major types of lava flows. Pahoehoe – ropy
Aa – jagged Blocky Lava – large chunks
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Pahoehoe
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Aa
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#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 Material volcanic ash/dust volcanic bombs lapilli
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Volcanic Ash
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Bomb
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#5 Identify the three main types of volcanic cones. shield volcano
cinder cones composite volcano
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Types of Volcanoes
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Shield Volcano Mauna Loa - Hawaii
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Cinder Cone
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Composite Volcano
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#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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Caldera
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Crater Lake
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#7 List three events that may precede a volcanic eruption.
earthquake activity rock temperatures increase volcano area bulges
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#8 Would 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 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 End On “Io” a moon of Jupiter
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