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