Q.1
True or false: People on the beach always see a rising sea as the tsunami approaches, and this helps to warn them.
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True
False
Q.2
For a person near the sea, which of these is a reliable warning about at oncoming tsunami?
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A siren or radio warning from a tsunami-warning system
A strong shaking of the ground
seeing the sea retreat, exposing seashore that is normally under water
all of the above
Q.3
Tsunami-warning systems operate automatically because
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the warning must be issued within minutes of the earthquake
that saves money
an enormous number of calculations are needed to make a good warning
the warning must be translated into several languages
Q.4
Which factor does not influence the height of a tsunami?
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water temperature
proximity of the earthquake to shore
amount of vertical movement of the seafloor
area of seafloor that moves
Q.5
Even though a tsunami may be barely perceptible as it crosses open ocean, it can carry a vast amount of energy. Why?
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because the wave height is shallow, it can move quickly
the wave moves such a large quantity of water
although the surface of the water is not rising and falling much, that small rise carries a huge amount of energy