Question 1

In the Atlantic Ocean region,where are most of the active volcanoes located?

Accepted Answer

A) along the coastlines of the Americas 
B) on the continental shelves 
C) along the Mid-Atlantic Ridge 
D) distributed randomly along the seafloor 
A) along the coastlines of the Americas 
B) on the continental shelves 
C) along the Mid-Atlantic Ridge 
D) distributed randomly along the seafloor C

Question 2

Roughly what volume of the ocean has been recycled through the world mid-ocean rift systems in the last 5 million years?

Accepted Answer

A) 5 percent 
B) 25 percent 
C) 50 percent 
D) 100 percent 
A) 5 percent 
B) 25 percent 
C) 50 percent 
D) 100 percent C

Question 3

The Hawaiian term pahoehoe is use to describe?

Accepted Answer

A) a certain look for a lava flow 
B) the shape of volcanoes 
C) a particular type of shield volcano 
D) pillow basalt 
A) a certain look for a lava flow 
B) the shape of volcanoes 
C) a particular type of shield volcano 
D) pillow basalt A

Question 4

The geologic rock record shows that there have been at least ____ major volcanic explosions in the southwest United States in the last 2 million years.

Accepted Answer

A) two 
B) four 
C) six 
D) eight 
A) two 
B) four 
C) six 
D) eight

Question 5

What is molten rock beneath Earth's surface called?

Accepted Answer

A) granite 
B) lava 
C) lithosphere 
D) magma 
A) granite 
B) lava 
C) lithosphere 
D) magma

Question 6

Basaltic lava that cools under water forms distinct _________ features.

Accepted Answer

A) pillow lava 
B) pahoehoe 
C) vesicular 
D) aa 
A) pillow lava 
B) pahoehoe 
C) vesicular 
D) aa

Question 7

What type of volcano consists of both lava flows and pyroclastic deposits?

Accepted Answer

A) a cinder cone 
B) a shield volcano 
C) a stratovolcano 
D) a volcanic dome 
A) a cinder cone 
B) a shield volcano 
C) a stratovolcano 
D) a volcanic dome

Question 8

Almost all of the 25,000 people killed in the 1985 eruption of Nevada del Ruiz in Columbia were killed by

Accepted Answer

A) a very thick volcanic ash fall. 
B) a large mudflow of volcanic debris. 
C) a fast-moving lava flow. 
D) collapse of a volcanic caldera. 
A) a very thick volcanic ash fall. 
B) a large mudflow of volcanic debris. 
C) a fast-moving lava flow. 
D) collapse of a volcanic caldera.

Question 9

Which of the following gases is the main constituent of volcanic gas?

Accepted Answer

A) carbon dioxide 
B) nitrogen 
C) sulfur dioxide 
D) water vapor 
A) carbon dioxide 
B) nitrogen 
C) sulfur dioxide 
D) water vapor

Question 10

How much pyroclastic debris was erupted from Yellowstone caldera 630,000 years ago?

Accepted Answer

A) approximately1 cubic kilometer 
B) approximately 10 cubic kilometers 
C) approximately 100 cubic kilometers 
D) approximately 1000 cubic kilometers 
A) approximately1 cubic kilometer 
B) approximately 10 cubic kilometers 
C) approximately 100 cubic kilometers 
D) approximately 1000 cubic kilometers

Question 11

What is the name for a basaltic lava flow that has a ropy,folded surface?

Accepted Answer

A) aa 
B) breccia 
C) pahoehoe 
D) tuff 
A) aa 
B) breccia 
C) pahoehoe 
D) tuff

Question 12

Aseismic ridges are most likely generated by volcanism at

Accepted Answer

A) spreading centers. 
B) island arcs. 
C) subduction zones. 
D) hot spots. 
A) spreading centers. 
B) island arcs. 
C) subduction zones. 
D) hot spots.

Question 13

Many of the gases emitted by volcanoes can affect climate greatly and be harmful to humans.Which of the following is least harmful?

Accepted Answer

A) carbon dioxide 
B) nitrogen 
C) sulfur dioxide 
D) water vapor 
A) carbon dioxide 
B) nitrogen 
C) sulfur dioxide 
D) water vapor

Question 14

What are some of the highest speeds that lavas have been observed flowing?

Accepted Answer

A) 100 m/sec 
B) 100 km/sec 
C) 100 km/hour 
D) 100 m/hour 
A) 100 m/sec 
B) 100 km/sec 
C) 100 km/hour 
D) 100 m/hour

Question 15

How fast is the North American plate moving?

Accepted Answer

A) 25 mm/yr 
B) 75 mm/yr 
C) 200 mm/yr 
D) 500 mm/yr 
A) 25 mm/yr 
B) 75 mm/yr 
C) 200 mm/yr 
D) 500 mm/yr

Question 16

Which of the following is least likely to signal an impending volcanic eruption?

Accepted Answer

A) earthquakes 
B) gas emissions 
C) tsunamis 
D) swelling of the volcano 
A) earthquakes 
B) gas emissions 
C) tsunamis 
D) swelling of the volcano

Question 17

Find the correct match between magma type and volcano type.

Accepted Answer

A) felsic/dome 
B) mafic/dome 
C) intermediate/shield volcano 
D) felsic/cinder cone 
A) felsic/dome 
B) mafic/dome 
C) intermediate/shield volcano 
D) felsic/cinder cone

Question 18

The volcanism at spreading centers occurs as a result of ________ melting.

Accepted Answer

A) fluid-induced 
B) decompression 
C) convection 
D) conduction 
A) fluid-induced 
B) decompression 
C) convection 
D) conduction

Question 19

What volcano represents a major hazard to the cities of Seattle and Tacoma in Washington state?

Accepted Answer

A) Mount Rainier 
B) Mount St.Helens 
C) Mount Shasta 
D) Yellowstone 
A) Mount Rainier 
B) Mount St.Helens 
C) Mount Shasta 
D) Yellowstone

Question 20

Diatremes are a type of

Accepted Answer

A) caldera. 
B) volcano. 
C) volcanic neck material. 
D) lava flow. 
A) caldera. 
B) volcano. 
C) volcanic neck material. 
D) lava flow.

Exam 12: Volcanoes

In the Atlantic Ocean region,where are most of the active volcanoes located?

Roughly what volume of the ocean has been recycled through the world mid-ocean rift systems in the last 5 million years?

The Hawaiian term pahoehoe is use to describe?

The geologic rock record shows that there have been at least ____ major volcanic explosions in the southwest United States in the last 2 million years.

What is molten rock beneath Earth's surface called?

Basaltic lava that cools under water forms distinct _________ features.

What type of volcano consists of both lava flows and pyroclastic deposits?

Almost all of the 25,000 people killed in the 1985 eruption of Nevada del Ruiz in Columbia were killed by

Which of the following gases is the main constituent of volcanic gas?

How much pyroclastic debris was erupted from Yellowstone caldera 630,000 years ago?

What is the name for a basaltic lava flow that has a ropy,folded surface?

Aseismic ridges are most likely generated by volcanism at

Many of the gases emitted by volcanoes can affect climate greatly and be harmful to humans.Which of the following is least harmful?

What are some of the highest speeds that lavas have been observed flowing?

How fast is the North American plate moving?

Which of the following is least likely to signal an impending volcanic eruption?

Find the correct match between magma type and volcano type.

The volcanism at spreading centers occurs as a result of ________ melting.

What volcano represents a major hazard to the cities of Seattle and Tacoma in Washington state?

Diatremes are a type of

The Earth System

Plate Tectonics: The Unifying Theory

Earth Materials: Minerals and Rocks

Igneous Rocks: Solids From Melts

Sedimentation: Rocks Formed by Surface Processes

Metamorphism: Alteration of Rocks by Temperature and Pressure

Deformation: Modification of Rocks by Folding and Fracturing

Clocks in Rocks: Timing the Geologic Period

Early History of the Terrestrial Planets

History of the Continents

Geobiology: Life Interacts With Earth

Earthquakes

Exploring Earths Interior

The Climate System

Weathering,erosion,and Mass Wasting: Interactions Between the Climate and Plate Tectonic Systems

The Hydrologic Cycle and Groundwater

Stream Transport: From Mountains to Oceans

Winds and Deserts

Coastlines and Ocean Basins

Glaciers: the Work of Ice

Landscapes: Tectonic and Climate Interaction

The Human Impact of Earths Environment

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