Before the first big wave of a tsunami,the sea may either ________ or suddenly _______.

Question

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Before the first big wave of a tsunami, the sea may suddenly withdraw or recede within minutes. This is caused by the tsunami waves drawing the water away from the shore as they approach. The sudden rise in water level following this withdrawal is the first sign of an incoming tsunami. The option (C) is incorrect as the sea may not necessarily be calm before a tsunami. Option (A) is also incorrect as churning up of the sea may happen during the tsunami and not necessarily before. Option (D) is also incorrect as the sea is not calm after the sudden withdrawal.

Before the First Big Wave of a Tsunami,the Sea May