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Science -- Earth science
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Antarctica: Sea Ice
This video segment, adapted from a NOVA broadcast, shows how sea ice forms in the Southern Ocean around Antarctica and how its seasonal fluctuation dramatically changes the continent. The segment, two minutes...
Enhanced F Scale for Tornado Damage
This is an update to the original Fujita Scale for wind speeds and tornado damage. The Enhanced F-scale uses three-second gusts estimated at the point of damage based on a judgment of 8 levels of damage to the 28...
The Orphan Tsunami of 1700: Japanese Clues to a Parent Earthquake in North America
This text relates a scientific detective story through clues from both sides of the Pacific. In the year 1700, a mysterious tsunami flooded fields and washed away houses in Japan. It arrived without the warning that a...
EarthScope: Earthquake in Tonga
This bulletin discusses the magnitude 7.9 earthquake that shook the islands of Tonga in May 2006. Topics include the tectonic setting of the islands, at the boundary of the Pacific and Australian plates, the frequent...
Caves: Extreme Conditions for Life
This video segment, adapted from a NOVA broadcast, discusses the extreme environments that caves present for living organisms, and the unique strategies for survival adopted by communities of cave-dwelling microbes that...
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