The volcano shown with its long, gentle slopes would best be described as a shield volcano.
X
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True or False
Magma erupts through an opening in Earth’s crust called a vent.
X
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True or False
Volcanoes associated with convergent plate boundaries form the Circum-Pacific and the Mediterranean Belts.
X
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True or False
Composite volcanoes are made of basaltic lava.
X
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True or False
Cinder-cone volcanoes have steep sides and are generally the smallest volcanoes.
X
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True or False
Temperature and pressure decrease with depth beneath Earth’s surface.
X
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True or False
A pluton is an intrusive metamorphic rock body formed from magma.
X
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True or False
The hotter the magma or lava, the greater is its viscosity.
X
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True or False
Lava that has low viscosity moves slower than lava with high viscosity
X
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True or False
All volcanoes form at plate boundaries.
X
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Internal resistance to flow is
a.Silicab.Tephra
c.pyroclasticd.viscosity
X
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Depression that forms when the top or side of a volcano collapses into the magma chamber is aa.Calderab.Pluton
c.Tephrad.Pyroclastic
material
X
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Opening in Earth’s crust through which lava erupts
a. Calderab. Craterc. Plutond. Vent
X
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Types of plutons include ____.
a.shields, cinder-cones, and composites
b.vents, craters, and calderas
c.dust, ash, lapilli, volcanic blocks, and volcanic bombs
d.batholiths, stocks, sills, dikes, and laccoliths
X
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Using the diagram to the right, which letter represents the crater associated with the volcano?a. Ab. Bc. Cd. D
X
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Using the diagram to the right, which letter represents the magma chamber associated with the volcano?a. Ab. Bc. Cd. D
X
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Bowl-shaped depression around a vent at the top of a volcano is a
a. Calderab. Craterc. Plutond. Vent X
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According to the diagram, which Hawaiian Island is the oldest?
a. Loihib. Hawaiic. Kauaid. Molokai
X
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Broad, gently sloping sides
a. shield volcanob. cinder-cone volcanoc. composite volcano
X
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Made of layers of tephra and lava
a. shield volcanob. cinder-cone volcanoc. composite volcano
X
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Steep-sided
a. shield volcanob. cinder-cone volcanoc. composite volcano
X
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Largest of the volcanoes
a. shield volcanob. cinder-cone volcanoc. composite volcano
X
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Forms from layers of basaltic lava
a. shield volcanob. cinder-cone volcanoc. composite volcano
X
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Forms as tephra ejected high into the air fall back to Earth and pile around
the venta. shield volcanob. cinder-cone volcanoc. composite volcano
X
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Forms in the upper mantle
a. basaltic magmab. andesitic magmac. rhyolitic magma
X
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Magma with the lowest viscosity
a. basaltic magmab. andesitic magmac. rhyolitic magma
X
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Most explosive form of magma
a. basaltic magmab. andesitic magmac. rhyolitic magma
X
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Magma Characteristics
Type of Magma
Source Material
Viscosity Gas Content
1. 2. 3. 1–2%
Andesitic magma
4. 5. 3–4%
Rhyolitic magma
Continental crust
6. 4-6%
Which type of magma is in #1?
ANSWER?
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Magma Characteristics
Type of Magma
Source Material
Viscosity Gas Content
Basaltic magma
Upper mantle
3. 1–2%
Andesitic magma
Oceanic Crust
5. 3–4%
Rhyolitic magma
Continental crust
6. 4-6%
What is the viscosity of basaltic magma, low, medium or high?
ANSWER?
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Magma Characteristics
Type of Magma
Source Material
Viscosity Gas Content
Baslatic magma
Upper mantle
Low 1–2%
Andesitic magma
Oceanic Crust
5. 3–4%
Rhyolitic magma
Continental crust
6. 4-6%
What is the viscosity of andesitic magma, low, medium or high?
ANSWER?
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Magma Characteristics
Type of Magma
Source Material
Viscosity Gas Content
Basaltic magma
Upper mantle
Low 1–2%
Andesitic magma
Oceanic Crust
Medium 3–4%
Rhyolitic magma
Continental crust
6. 4-6%
What is the viscosity of rhyolitic magma, low, medium or high?
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How is convergent volcanism different from divergent volcanism?
X
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Contrast the three major types of volcanoes.
X
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Final Jeopardy
• Why does lava containing large amounts of dissolved gases generally produce a more violent explosion than lava that contains small amounts of dissolved gases?