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| 1 | |
Which of the following magmas has the highest viscosity? |
| | A) | High silica content, high temperature |
| | B) | High silica content, low temperature |
| | C) | Low silica content, high temperature |
| | D) | Low silica content, low temperature |
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| 2 | |
Which plate boundaries are most likely to form mountains? |
| | A) | Convergent |
| | B) | Divergent |
| | C) | Transform |
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| 3 | |
Which type of convergent plate boundary is most likely to have mountains, but not volcanoes? |
| | A) | Continent-continent |
| | B) | Ocean-continent |
| | C) | Ocean-ocean |
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| 4 | |
Which type of convergent plate boundary is most likely to have volcanoes, but not mountains? |
| | A) | Continent-continent |
| | B) | Ocean-continent |
| | C) | Ocean-ocean |
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| 5 | |
How many active volcanoes are there on Earth? |
| | A) | Less than 500 |
| | B) | Between 500 – 1,500 |
| | C) | More than 1,500 |
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| 6 | |
Where is the "Ring of Fire" located? |
| | A) | Yellowstone |
| | B) | Around the equator |
| | C) | Australia |
| | D) | Around the Pacific Ocean |
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| 7 | |
What type of volcanoes form the Hawaiian Islands? |
| | A) | Shield volcanoes |
| | B) | Stratovolcanoes |
| | C) | Cinder cone volcanoes |
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| 8 | |
How many people live within the danger zone of active volcanoes on Earth? |
| | A) | About 50,000 |
| | B) | About 500,000 |
| | C) | About 5,000,000 |
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| 9 | |
What is the most important factor used to determine the volcanic explosivity index of an eruption? |
| | A) | Volume of erupted material |
| | B) | Composition of the erupted material |
| | C) | Speed of erupted material |
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| 10 | |
How much of Mount St. Helens was blown off during the 1980 eruption? |
| | A) | 40 meters |
| | B) | 400 meters |
| | C) | 4,000 meters |
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| 11 | |
Where was the largest documented volcanic eruption on the continental United States? |
| | A) | Mount St. Helens |
| | B) | Mount Hood |
| | C) | Yellowstone |
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| 12 | |
This material ejected from an erupting volcano includes airborne particles of all size. |
| | A) | Tephra |
| | B) | Ash |
| | C) | Lahar |
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| 13 | |
This large volcanic eruption generated so much ash that global temperatures cooled by about 0.5°C for two years following the event. |
| | A) | Mount St. Helens |
| | B) | Mount Pinetubo |
| | C) | Mount Tambora |
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| 14 | |
What material comprises most mountains? |
| | A) | Volcanic rocks |
| | B) | Crustal rocks |
| | C) | Mantle rocks |
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| 15 | |
What is the balance between topography and the thickness and composition of the underlying material? |
| | A) | Isostasy |
| | B) | Density |
| | C) | Elevation |
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| 16 | |
Which of the following hazards is not commonly associated with volcanic eruptions? |
| | A) | poisonous or otherwise deadly gases |
| | B) | pyroclastic flows |
| | C) | lava flows |
| | D) | lahars |
| | E) | all of the above are hazards associated with volcanic eruptions |
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