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Dead zones

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Cape Perpetua, Ore. – A hypoxic dead zone of at least 300 miles that seems to exist only in the summer has been forming off the Oregon coast since 2000. Researchers believe that changing coastal winds and marine conditions are causing the hypoxia, and they've reported massive fish and crab deaths within that area in recent years. Source: Science Now, EPA)

PHOTO: Newscom/File

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