Why do some ocean waves break into white foam?
Quick Answer
Waves foam when their tops become unstable, collapse, and trap air as they break. The churning mixes water and air into bubbles that look white from reflected light.
The Full Story
As a wave approaches shallow water, the bottom slows first while the top continues moving faster. The wave steepens, becomes unstable, and then breaks, collapsing into turbulent water that traps air. Countless bubbles scatter light in many directions, which is why foam looks white. The exact shape of breaking waves depends on wind, depth, and seabed slope, so some waves spill gently while others crash violently. Foam can also include dissolved organic material from marine life, which helps stabilize it in some places.
Key Facts
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"Why does a blue wave turn white when it crashes?"
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