21. The blue-and-white signs show a person running from a giant wave . 22. NHK said there was no danger of tsunami, or giant waves caused by earthquakes. 23. However, they are all killed when a giant wave topples and smashes the boat. 24. A passing typhoon sent giant waves pounding against the ship and caused it to keel. 25. We went over about five times, and then this giant wave broke right on us, 26. Some say Atlantis was washed away by giant waves , possibly following earthquakes under the ocean. 27. A tsunami is a giant wave caused by undersea disturbances such as earthquakes or volcanic activities. 28. Two men rode their boards into the surf to challenge Hurricane Bertha's giant waves . 29. His enthusiasm for gymnastics brought him under forestry colleagues entitled " forester giant wave " field. 30. He argued that the simple idea could be effective in preparing people for the giant waves .
