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Chapter 9 CRCT Preparation
1. An underground surge in magma causes a sudden and significant increase in the ground temperature of a glacier covered volcano. This will most likely result in
A flooding or a mudslide.
B a global temperature increase.
C a tidal wave.
D a forest fire.
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Chapter 9 CRCT Preparation
1. An underground surge in magma causes a sudden and significant increase in the ground temperature of a glacier covered volcano. This will most likely result in
A flooding or a mudslide.
B a global temperature increase.
C a tidal wave.
D a forest fire.
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Chapter 9 CRCT Preparation
2. A student models a volcanic eruption by using a syringe to inject blue colored water through a dome shaped gelatin mold. What is one of this model’s most significant limitations?
A Gelatin is clear, whereas actual volcanoes are opaque.
B Gelatin does not accurately simulate the materials of which actual volcanoes are made.
C Actual volcanoes have red lava, not blue.
D Actual volcanoes erupt with more force than a syringe.
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Chapter 9 CRCT Preparation
2. A student models a volcanic eruption by using a syringe to inject blue colored water through a dome shaped gelatin mold. What is one of this model’s most significant limitations?
A Gelatin is clear, whereas actual volcanoes are opaque.
B Gelatin does not accurately simulate the materials of which actual volcanoes are made.
C Actual volcanoes have red lava, not blue.
D Actual volcanoes erupt with more force than a syringe.
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Chapter 9 CRCT Preparation
3. When a volcanic explosion fills the atmosphere with a large amount of volcanic ash, which of the following is a likely result?
A The average global temperature will decrease.
B The average duration of a day will become shorter.
C Ocean tide levels will be affected.
D Only the area near the volcano will be affected.
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Chapter 9 CRCT Preparation
3. When a volcanic explosion fills the atmosphere with a large amount of volcanic ash, which of the following is a likely result?
A The average global temperature will decrease.
B The average duration of a day will become shorter.
C Ocean tide levels will be affected.
D Only the area near the volcano will be affected.
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Chapter 9 CRCT Preparation
Use the illustration to answer question 4.
4. What is the term for the area to which the arrow is pointing?
A lava
B crater
C vent
D magma chamber
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Chapter 9 CRCT Preparation
Use the illustration to answer question 4.
4. What is the term for the area to which the arrow is pointing?
A lava
B crater
C vent
D magma chamber
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Chapter 9 CRCT Preparation
5. Which of the following situations represents the greatest amount of potential energy?
A A large bolder is blown into the air by an explosive eruption.
B Low viscosity lava flows quickly downhill.
C A huge boulder is perched atop a cliff and is on the verge of falling 1000 m to the ground below.
D A tree that was blown over by a powerful eruption lies flat on the ground.
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Chapter 9 CRCT Preparation
5. Which of the following situations represents the greatest amount of potential energy?
A A large bolder is blown into the air by an explosive eruption.
B Low viscosity lava flows quickly downhill.
C A huge boulder is perched atop a cliff and is on the verge of falling 1000 m to the ground below.
D A tree that was blown over by a powerful eruption lies flat on the ground.
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Chapter 9 CRCT Preparation
6. A model of a volcano that uses vinegar and baking soda is limited because
A the eruption is unpredictable.
B baking soda is white, while lava is red.
C real volcanoes are much larger than the model.
D most volcanoes are extinct.
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Chapter 9 CRCT Preparation
6. A model of a volcano that uses vinegar and baking soda is limited because
A the eruption is unpredictable.
B baking soda is white, while lava is red.
C real volcanoes are much larger than the model.
D most volcanoes are extinct.
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Chapter 9 CRCT Preparation
7. In which of the following situations would there be the greatest amount of kinetic energy?
A just prior to eruption, when incredible pressure has built up inside a volcano
B during an explosive eruption in which pyroclastic material is blown high into the atmosphere
C just after an explosive eruption, when most of the debris has settled back to the ground.
D long after a shield volcano has moved from a “hot spot”
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Chapter 9 CRCT Preparation
7. In which of the following situations would there be the greatest amount of kinetic energy?
A just prior to eruption, when incredible pressure has built up inside a volcano
B during an explosive eruption in which pyroclastic material is blown high into the atmosphere
C just after an explosive eruption, when most of the debris has settled back to the ground.
D long after a shield volcano has moved from a “hot spot”
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Chapter 9 CRCT Preparation
Use the table to answer question 8.
8. According to the data collected above, which type of magma is least likely to cause an explosive eruption?
A felsic magma C mafic
B intermediate magma D ultramafic
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Chapter 9 CRCT Preparation
Use the table to answer question 8.
8. According to the data collected above, which type of magma is least likely to cause an explosive eruption?
A felsic magma C mafic
B intermediate magma D ultramafic
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Chapter 9 CRCT Preparation
9. One of the active volcanoes on the island of Hawaii is named Kilauea. If Kilauea is a shield volcano, which of the following is a valid conclusion?
A Kilauea formed from repeated eruptions of low viscosity lava that have spread over a wide area.
B Kilauea formed from repeated moderately explosive eruptions of pyroclastic material.
C Kilauea is primarily made up of alternating layers of lava and pyroclastic material.
D Kilauea has formed a cinder cone through repeated eruptions of high viscosity lava.
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Chapter 9 CRCT Preparation
9. One of the active volcanoes on the island of Hawaii is named Kilauea. If Kilauea is a shield volcano, which of the following is a valid conclusion?
A Kilauea formed from repeated eruptions of low viscosity lava that have spread over a wide area.
B Kilauea formed from repeated moderately explosive eruptions of pyroclastic material.
C Kilauea is primarily made up of alternating layers of lava and pyroclastic material.
D Kilauea has formed a cinder cone through repeated eruptions of high viscosity lava.
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Chapter 9 CRCT Preparation
10. A large volcanic eruption covers nearby farmland in several meters of ash. Which is a true statement about the ash in the immediate future?
A The ash will be an effective plant fertilizer and will result in record crop yields.
B The ash will smother the crops, possibly leading to food shortages in the immediate area.
C The ash will be a nuisance, but it can easily be removed from the area.
D The ash may cause thunderstorms.
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Chapter 9 CRCT Preparation
10. A large volcanic eruption covers nearby farmland in several meters of ash. Which is a true statement about the ash in the immediate future?
A The ash will be an effective plant fertilizer and will result in record crop yields.
B The ash will smother the crops, possibly leading to food shortages in the immediate area.
C The ash will be a nuisance, but it can easily be removed from the area.
D The ash may cause thunderstorms.
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Chapter 9 CRCT Preparation
11. Georgia has no volcanoes. Yet, Georgia’s climate can still be affected by volcanoes. How?
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Chapter 9 CRCT Preparation
11. Answer - Full credit answers should include the following points:
• Erupting volcanoes can throw volcanic ash and gases high into the upper atmosphere.
• Winds can move ash and gases throughout the globe.
• When a large volume of volcanic ash is hurled into the atmosphere, the ash blocks sunlight and decreases the global temperature for a short period of time.
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Chapter 9 CRCT Preparation
12. How does magma form at a convergent boundary?
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Chapter 9 CRCT Preparation
12. Answer - Full credit answers should include the following points:
• As the oceanic lithosphere descends, temperature and pressure on the subducting plate increase.
• Increased heat and pressure cause the water in the subducting oceanic lithosphere to be released.
• The water lowers the melting point of rock in the mantle, and the rock melts.
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