Discussion
Just prior to a Tsunami coming ashore, sea level appears to fall quickly. This phenomenon is called :
Answer: C
The apparent fall in sea level is called Draw down (drawdown).
When the trough of a tsunami reaches the coast before the crest, the sea retreats rapidly and exposes the seabed, sometimes by hundreds of metres. This drawdown is a natural warning sign that the crest will follow within minutes, as happened on many coasts in December 2004.
'Sea level drop', 'draw fall' and 'dip in sea level' are descriptive phrases, but drawdown is the accepted term for this phenomenon.
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