Which of the below is an expected thickness of a crustal plate?
A) 1 km (0.6 miles)
B) 10 km (6 miles)
C) 100 km (60 miles)
D) 1,000 km (600 miles)
E) 10,000 km (6,000 miles)
Answer: C
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The main hazard of an eruption that forms a large caldera is
A) burning, building collapse, and suffocation from an eruption column and pyroclastic flows. B) volcanic mudflows and landslides. C) hot fragments thrown a short distance from the volcano. D) destruction by moderately fluid lava flows that can flow far from the volcano.
The western margin of North America is an active subduction zone except for the zone along the Cascade Range,
which is a transform fault boundary. a. True b. False
Clouds are least likely to occur in the:
A) mesosphere. B) troposphere. C) ionosphere. D) stratosphere.
The least violent volcanic eruptions usually come from which of the following?
a. calderas b. shield volcanoes c. composite cones d. cinder cones e. plug domes