Destructive waves are a type of natural disaster that can cause immense destruction and loss of life. Tsunamis, which are 8 letters long, are one of the most destructive types of waves. They are caused by large-scale disturbances in the ocean, such as earthquakes, landslides, or volcanic eruptions, and can travel thousands of miles across the ocean before crashing onto shorelines. Tsunamis can cause massive flooding, destruction of buildings, and loss of life.