Any volcanic mud or debris flow is called a(n) _______________ by volcanologists.
Fill in the blank with correct word.
Question 2When ash combines with water, it can form _______________ with a consistency of wet concrete
Fill in the blank with correct word.
Question 3The town of Bend, Oregon ____.
a. is in the path of a mudflow from Mt. Rainier
b. is built on land from previous landslides from Mt. Shasta
c. was nearly destroyed by pyroclastic flows from Mt. St. Helens
d. is in danger of flooding if Mt. Mazama becomes active and ruptures the wall of Crater Lake
e. is next to an active bulging beside one of the Three Sisters volcanoes
Question 4The greatest clear danger posed by Californias Mt. Shasta is ____.
a. gas emissions and swarms of small earthquakes, which indicate that an eruption is imminent
b. a hazard to shipping due to its close proximity to the ocean
c. the potential for huge landslides from slopes made of loose material covered by lava flows
d. pyroclastic flows threatening dozens of small towns built in nearby valleys on tuff
e. continuous seepage of carbon dioxide, which has killed thousands of trees and some hikers
Question 5The caldera now filled by Crater Lake
a. is the center of the Mazama resurgent caldera
b. formed as the top of the Mt. Mazama collapsed into the magma chamber after a major eruption
c. was formed in a titanic eruption that destroyed Mt. Mazama and blasted pieces of it over hundreds of square kilometers.
d. is the cooled vent formed when Mt. Mazama became an extinct volcano
e. prevents future eruptions by providing a way to cool rising magma
Question 6Forecasts of the Mt. St. Helens eruption in 1980 were ____.
a. accurate about the force of the eruption, but not its timing
b. mostly incorrect, leading to mistrust by local authorities and residents
c. mostly correct, but were not acted on properly by authorities and residents
d. not made, because the proper technology had not been developed
e. correct, but did not reach local authorities in time to act on them
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