The height of a tsunami grows as it approaches a coastline primarily because
A) its energy level increases.
B) its wavelength shortens.
C) the height of the surf is added to the height of the tsunami.
D) trick question-the height of a tsunami remains constant from the time of its origin.

Question

Quizplus · Accepted Answer

The height of a tsunami grows as it approaches a coastline primarily because its wavelength shortens. The energy level of the wave does not change, but as it enters shallower water, its frequency decreases, causing its wavelength to shorten and its height to increase. The height of the surf is also a factor for waves breaking on the shore, but it is not the primary reason for the increasing height of a tsunami. The fourth choice is a trick question as the height of a tsunami can vary depending on various factors.

The Height of a Tsunami Grows as It Approaches a Coastline