When the first act opens, Bernardo appears to relieve Francisco from duty, but it is so dark they both fearfully call out "who's there?" until they realize it's just guardsmen. We find out that the guardsmen have been spotting the ghost of King Hamlet.
Answer: there is an error in sentence 1.
D. Faults in the Earth’s surface are responsible for earthquakes, which can cause giant destructive waves known as a tsunami.
