Think of gravity waves as waves moving through stable air. When you look at waves in the ocean, there are high parts and low parts to that wave. Clouds need lift to materialize in the atmosphere.
Gravity waves in the atmosphere are a common phenomenon. NASA released a beautiful image of waves forming around an island two years ago, for example. They are also not exclusively an Earthly ...
The pounding that sailors’ brains take from years of high-speed wave-slamming in the Special Boat Teams can cause symptoms that wreck their careers — and their lives.