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When volcanoes erupt, they can release ash, chunks of rock and torrents of lava. Now scientists have found that eruptions also can spew massive amounts of a chemical called bromine. This gas helps destroy the ozone layer, a segment of the upper atmosphere that protects life on Earth from the sun's harmful ultraviolet rays.

Flying predators probably gobbled up the biggest of the large flying insects 150 million years ago About 300 million years ago, long before the first dinosaurs appeared, a different type of oversized critter inhabited Earth: giant insects. Scientists suspect bugs grew bigger then because the atmosphere contained more oxygen than it does now.

Lead poisoning stymies condor recovery Iconic species may not stand on its own without complete shift to nontoxic ammunition Web edition : Tuesday, June 26th, 2012 The California condor's return to flying free in the wild after a close brush with extinction may be an illusory recovery.