ch 7 volcanoes 2 reading quiz
Mt. Rainier, Washington, is number one on the danger list of many U.S. volcanologists because of its __________. great height extensive glacial cap frequent earthquakes active hot-water spring systems, which have weakened the mountain internally All of these choices are correct.
All of these choices are correct.
During the 1990s, hundreds of trees were killed at Mammoth Mountain, California, by the diffuse emission of _________ gas. O2 SiO2 CO CO2 H2S
CO2
Drag and drop the appropriate labels onto the figure below.
Figure 7.22
Match the numbered features of a subduction zone with the features that are found within it.
Figure 7.5
Dome collapse, overspilling crater rim, direct blast, and eruption column collapse are all ways to generate __________. pyroclastic flows lava flows fissure eruptions felsic magma mafic magma
pyroclastic flows
In August 1986, a gigantic volume of __________ belched forth from Lake Nyos in Cameroon and swept down the adjacent valleys asphyxiating 1,700 people. sulfur dioxide carbon dioxide hydrogen sulfide carbon monoxide super-heated H2O
carbon dioxide
Which of the following are being studied to help forecast volcanic eruptions? gas measurements tsunami nearby seismic waves landslide frequency heavy rainfall ground deformation
gas measurements seismic waves ground deformation
The energy behind the 1902 pyroclastic flow that destroyed St. Pierre came from _________________. the blast of the volcano gravity gas escaping from pieces of airborne pyroclastic material, creating a "popcorn" effect All of these choices are correct.
All of these choices are correct.
Violent causes of death from volcanic eruptions include _______________. pyroclastic flows tsunami lahars poison gases All of these choices are correct.
All of these choices are correct.
A genuine success story of advance warning before a large eruption occurred in the Philippines in 1991 before the climactic eruption of _________________. Mt. Pinatubo Nevado Del Ruiz Mont Pelée Mt. Mayon Popocatepetyl
Mt. Pinatubo
In 1985, __________ produced a minor eruption that melted part of a glacier near its summit, sending a lahar down its slopes and killing at least 22,000 people. Vesuvius, Italy, Mont Pelée, Martinique, Mt. Mayon, Philippines, Nevado Del Ruiz, Colombia, Popocatepetyl, Mexico,
Nevado Del Ruiz, Colombia
Most of the people killed by the Mount St. Helens eruption of 1980 __________. were burned by lava flows had gone around barriers meant to keep people out of 'harms' way were scientists on top of the mountain were in a town thought to be within a safe-zone drowned when a large dam failed
had gone around barriers meant to keep people out of 'harms' way
The Mt. Pinatubo endangered people, animals, and property when its 1991 eruption resulted in __________. massive lava flows lahars and pyroclastic flows acid rain pelting lapili the release of poisonous gases
lahars and pyroclastic flows
After looking at the image, place the labels in the proper order from first to last to describe the eruption of Mt. St. Helens in 1980. ___ blast ___ vertical eruption (plinian) ___ dome building ___ landslide/avalanche ___ pre eruption ___ bulge
pre eruption bulge landslide/avalanche blast vertical eruption (plinian) dome building
Active volcanoes today in Oregon and Washington, including Mt. St. Helens, result from _________________. heat generated by friction on the San Andreas Fault the subduction of the Juan de Fuca Plate beneath North America the subduction of the Pacific Plate beneath North America spreading of the Juan de Fuca Ridge continent-continent collision
the subduction of the Juan de Fuca Plate beneath North America
What was the origin of the gas that killed 1,700 people in Cameroon in 1996? It leaked upward from basaltic magma underlying a lake. It flowed down the side of an erupting volcano. It was released from a geyser in a nearby national park. It was released in a lateral blast of a cinder cone. It was formed when acid rain fell on volcanic soils.
It leaked upward from basaltic magma underlying a lake.
