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These clouds look unreal, but they are a real phenomenon called Kelvin Helmholtz clouds. They form when one layer of air...
These clouds look unreal, but they are a real phenomenon called Kelvin Helmholtz clouds. They form when one layer of air ...
Your class is on a hike when suddenly a thunderstorm develops. What can you do to make sure your class stays safe no matter what the weather? Join Smithsonian educators, who will explore phenomenon ...
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