This 2023 astronaut photo shows a pair of perfectly aligned "wave clouds" rippling above the Crozet Islands in the Southern ...

The speed of these waves is influenced by the depth of the ocean: in deeper water, they can travel at speeds of up to 500 miles per hour. Approximately 80% of tsunamis are caused by earthquakes.

Dec. 8—In the effort to save valuable infrastructure from encroaching ocean waves, the city of Ocean Shores is using the natural material it's perhaps best known for. Millions of pounds of sand.