the two other examples of ways in which waves can be a destructive force for sailors are cross square waves and tsunami
Answer: Square waves and tsunami
Explanation:
A cross sea waves called as square waves are caused by two different waves meeting at different angles. It might look gentle on the surface but it is a very dangerous wave. This current is so strong enough to even hinder the course of boats and large ships.
Tsunami is a kind of harbour waves which results from a huge underwater earthquake. They move in extremely high velocity so it is highly dangerous and devastating. Typical tsunami wavelength is several hundred metres long.
