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Ana tightens up and becomes tropical

Up until Saturday morning, Ana had been referred to as a subtropical storm, rather than a tropical storm. What's the difference? The difference lies is how the two different storms are "born." Subtropical storms are usually ...

dateMay 11, 2015 in Earth Sciences
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Image: Global cloud fraction map of Earth

Decades of satellite observations and astronaut photographs show that clouds dominate space-based views of Earth. One study based on nearly a decade of satellite data estimated that about 67 percent of Earth's surface is ...

dateMay 11, 2015 in Earth Sciences
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