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Plate Tectonics: Further Evidence
Early evidence showing striking similarities between regions on opposite sides of vast oceans suggested that in Earth's distant past what are now separate continents may once have been connected. However, this evidence...
What Causes the Gulf Stream?
Even with the waves lapping at their feet, few people consider ocean currents and their importance to global climate. Although the Gulf Stream cannot be seen flowing by off North America's East Coast, in Western Europe,...
What Happens When an Oil Spill Occurs?
Large oil spills are not a common occurrence. When a tanker runs aground or collides with another vessel and releases its cargo to the sea, it's often major news, especially if the spill is near land. The images in this...
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...
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...
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