The term tsunami refers to which of the following?
a. a type of fault line
b. a way earthquakes can be measured
c. a huge ocean wave following an earthquake
d. a point inside earth's crust where an earthquake occurs

Tsunami is a big wave- up to 10 meters tall- that often follows a major earthquake and it is preceded by the sea line goingback into the sea: meaning that if you see the sea retracting, it is likely that a tsunami will follow and you should try to get to a higher land.

The correct answer is c)

Probably north korea if your family has decided to use only nuclear power.

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