Gulf Oil Spill a "Dead Zone in the Making"?

Other than a few orange tubes encircling a sandbar southwest of Louisiana's Chandeleur Islands, there's no sign anything's amiss.

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Oil bubbling up from the Gulf of Mexico wellhead, which sits more than 5,000 feet (about 1,500 meters) below the water's surface, is coming from even deeper inside the Earth.

That means the oil is heavier and thicker than the crude spilled in past, tanker-based disasters, noted Ron Kendall, chair of the Department of Environmental Toxicology at Texas Tech University in Lubbock.

Read the rest of the story at National Geographic