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Gravity waves in the atmosphere

Gravity waves in the atmosphere
Gravity waves in the atmosphere In this astronaut photo taken from the ISS, gravity waves are seen off the Lake Superior coast in Ontario, Canada, looking much like ripples on a pond. These are most likely caused by the instabilities from warm land air flowing over cool lake air. Note that the gravity waves are perpendicular to the flow. NASA (photo ID ISS036-E-11843)