- 1. What percent of the earth is covered by the continents?
A) 3%
B) 12%
C) 21%
D) 29%
- 2. What is a fissure in the earth's surface called where magma can be expelled?
A) magma
B) conduit
C) volcano
D) vent
- 3. What is a funnel shaped pit called near the top of a volcano?
A) fissure
B) lava flow
C) crater
D) rift zone
- 4. What is it called when a crater forms around a collapsed volcano vent?
A) parasitic vent
B) magma chamber
C) cinder zone
D) caldera
- 5. Yellowstone National Park is one of these.
A) magma chamber
B) hot spot
C) subduction zone
D) rift zone
- 6. A volcano made from pyroclastic material, with steep slopes, is called a _____.
A) composite volcano
B) cinder cone volcano
C) ring of fire
D) shield volcano
- 7. A volcano built by layers of lava, with gently sloping sides, is called a _____.
A) composite volcano
B) cinder cone volcano
C) shield volcano
D) hot spot
- 8. A volcano marked by explosive eruptions with a wide base and steep slopes, is called a _____.
A) cinder cone volcano
B) shield volcano
C) composite volcano
D) caldera
- 9. What two factors increase as you go deeper into the earth?
A) heat and pressure
B) pressure and magnetic polarity
C) magma and lava
D) heat and water temperature
- 10. What is a passage through which magma flows in a volcano called?
A) conduit
B) dike
C) drain vent
D) hallway
- 11. What sort of cloud can form in the air after some volcanic eruptions called?
A) ash cloud
B) volcanic bomb cloud
C) lava cloud
D) thunderstorm
- 12. Before lava reaches the surface, the molten material is called _____.
A) rock
B) magma
C) volcanic ash
D) basalt
- 13. Volcanoes belts form along _____.
A) all mountain ranges
B) islands
C) areas of elliptical fault lines
D) earth's plate boundaries
- 14. The formation of the Hawaiian Islands is an example of a _____.
A) hot spots
B) diverging plate boundaries
C) continental drift
D) Ring of Fire
- 15. The volcano that may erupt again at some time in the future is called _____.
A) active
B) extinct
C) explosive
D) dormant
- 16. What causes small earthquakes that occur around a volcano before it erupts?
A) plate tectonics
B) volcanic bombs
C) upward movement of magma
D) steam from boiling water
- 17. Magma that squeezes into cracks between rock layers and then hardens is called a _____.
A) vent
B) caldera
C) sill
D) batholith
- 18. A very large, intrusive, rock formation is called a _____.
A) sill
B) batholith
C) dike
D) mountain
- 19. Rocks that form when magma cools underground are called _____.
A) extrusive
B) intrusive
C) mudstone
D) sedimentary
- 20. Volcano only refers to the erupting magma and the lava flows it creates.
A) false
B) true
- 21. The smallest and most common type of volcano is the _____.
A) stratovolcano
B) composite
C) shield
D) cinder cone
- 22. A stratovolcano and a composite volcano are the same type of volcano.
A) true
B) false
- 23. A ground hugging avalanche of hot ash, pumice, rock fragments, and volcanic gas that rushes down the side of a volcano is called a _____.
A) ash cloud
B) lava flood
C) pyroclastic flow
D) parasitic event
- 24. A lahar is the same thing as a volcanic mud flow.
A) true
B) false
- 25. Pyroclastic fall refers to all but one of the following rocks. Which one does not belong on this list?
A) ash
B) bombs
C) gneiss
D) tuff
- 26. The most common gas released by magma is called _____.
A) sulfur dioxide
B) carbon dioxide
C) water
D) hydrochloric acid
- 27. One thing that geologists monitor to predict volcanic eruptions is earthquakes.
A) true
B) false
- 28. One thing that geologists monitor to predict volcanic eruptions is the transpiration of water.
A) true
B) false
- 29. One of the following is NOT a volcanic rock. Which one does not belong on this list?
A) pumice
B) obsidian
C) scoria
D) laccolith
- 30. Old Faithful In Yellowstone National Park is an example of a _____.
A) extrusion
B) hot spring
C) mineral spray
D) geyser
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