Physical Geology 14th Edition by Plummer – Test Bank

Physical Geology 14th Edition by Plummer – Test Bank

Chapter 04

Volcanism and Extrusive Rocks

True / False Questions

1. Measurements indicate that the worldwide average temperature dropped about a half degree Celsius for a couple of years after the eruption of Mt. St. Helens.
FALSE

Bloom’s Level: 1. Remember
Topic: Volcanoes and Volcanic Hazards

2. Weathered volcanic ash and lava produce excellent fertile soils.
TRUE

Bloom’s Level: 2. Understand
Topic: Volcanoes and Volcanic Hazards

3. Major volcanic peaks of the Cascade Mountains, like Mt. Rainier, Mt. Shasta, Mt. Hood, and Mt. St. Helens, have been active volcanoes for 30 to 40 million years.
FALSE

Bloom’s Level: 1. Remember
Topic: Volcanoes and Volcanic Hazards

4.  Tsunamis account for most fatalities in volcanic eruptions.
FALSE

Bloom’s Level: 1. Remember
Topic: Volcanoes and Volcanic Hazards

5. The original volcano Mount Mazama erupted to form Crater Lake, Oregon.
TRUE

Bloom’s Level: 1. Remember
Topic: Volcanoes and Volcanic Hazards

6. Silicic lavas, which are relatively high in silica, tend to be more fluid than mafic magmas.
FALSE

Bloom’s Level: 2. Understand
Topic: Igneous Environments

7. Most of the gas released by volcanic eruptions is sulfur dioxide.
FALSE

Bloom’s Level: 1. Remember
Topic: Volcanoes and Volcanic Hazards

8. Volcanic rocks, and the magma from which they formed, have a silica content that ranges from 45% to 75% by volume.
FALSE

Bloom’s Level: 1. Remember
Topic: Igneous Environments

9. Basalt is a variety of gabbro.
TRUE

Bloom’s Level: 1. Remember
Topic: Igneous Environments

10. Tuff is a rock composed of fine-grained pyroclastic particles.
TRUE

Bloom’s Level: 1. Remember
Topic: Igneous Environments
Topic: Volcanoes and Volcanic Hazards

11. Basalt is the most common mafic rock.
TRUE

Bloom’s Level: 1. Remember
Topic: Igneous Environments
Topic: Volcanoes and Volcanic Hazards

12. Pahoehoe lava flow is characterized by a ropy or billowy surface.
TRUE

Bloom’s Level: 1. Remember
Topic: Volcanoes and Volcanic Hazards

13. Volcanic domes are steep-sided domes or spine-shaped masses of volcanic rock formed from viscous lava that solidifies in or immediately above a volcano’s vent.
TRUE

Bloom’s Level: 1. Remember
Topic: Volcanoes and Volcanic Hazards