Ocean 115 - Introduction to Oceanography » Spring 2022 » Megastunami

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Question #1
What did the tree ring study in Latuya Bay, Alaska show?
A.   Earthquakes were common in the area
B.   There was oil deposits beneath the trees
C.   A violent force had hit the trees at some point in the past
D.   Gold dredging was common there
Question #2
How was the cause of the tree line discovered?
A.   By aerial surveillance
B.   By eyewitness accounts of another tsunami
C.   By seismic data
D.   By historical documents
Question #3
How is a seismic tsunami generated?
A.   By volcanoes erupting and pushing ash into the ocean
B.   By landslides hitting the ocean and pushing the water away
C.   By the up and down motion of rocks during earthquakes offsetting the water
D.   By lateral movement of rocks breaking during earthquakes offsetting the water
Question #4
Why are landslide-generated tsunamis a greater threat?
A.   They are more common than seismic tsunamis
B.   Seismic tsunamis offset the water upwards which means they are limited in height, landslide tsunamis offset the water all the way to the bottom so their height is limited only by the depth of the ocean, which, can be thousands of meters
C.   False, landslide tsunamis are not a greater threat
D.   Seismic tsunamis travel at a slower speed than landslide tsunamis
E.   Seismic tsunamis have to remain in the local area and landslide tsunamis travel over the whole ocean
Question #5
What were they testing in Zurich, Switzerland?
A.   They were testing landslides that generate megatsunamis, they physically model a landslide’s impact into water
B.   They were testing earthquakes that generate megatsunamis, they physically model an earthquake’s impact on the water
C.   They were testing to see how long a landslide will occur before it hits the water
D.   They were trying to predict the next time a volcano will erupt in the Canary Islands
E.   They were trying to see if landslides could cause tsunamis
Question #6
What areas are most prone to landslide tsunamis?
A.   Harbors
B.   Tropical beaches
C.   Glaciers
D.   River valleys
E.   Volcanic islands
Question #7
Why is this so (your answer from question six is used here)?
A.   The weight of the rocks in the area
B.   The way they formed
C.   The overall temperature
D.   The frequency of rainfall
E.   The amount of lightning
Question #8
Can water trapped between the dikes, becoming heated and expanded, cause the flanks of the volcano to collapse?
A.   Yes
B.   No
Question #9
What are two lines of evidence for a megatsunami hitting the Bahamas?
A.   Huge waves reshape some of the islands, blasting the chevron shaped ridges. The waves also ripped vast boulders from off the ocean floor and dropped them on land.
B.   The waves left the remains of whales high up on the local mountains and ripped vast boulders from off the ocean floor and dropped them on land.
C.   Carved into the rocks were inscriptions of past tsunamis and bat dropping showing the bats could not land under the wave.
D.   Huge waves reshape some of the islands, blasting the chevron shaped ridges. The waves also left the remains of whales high up on the local mountains.
Question #10
What cities in the video are particularly vulnerable to megatsunamis?
A.   Honolulu and Miami
B.   Boston, Honolulu
C.   Honolulu, Los Angeles, Anchorage
D.   London, Paris, New York
E.   Boston, New York, Miami

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