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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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That's an air gun.

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By exploding compressed air underwater, scientists map the subsurface of the seafloor.

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The process can reveal new deposits of fossil fuels and other important information,

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and now industry has permission to use airguns off the U.S.east coast.

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Which means more dead whales.

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Cetaceans and other marine life rely on their ears to navigate.

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Air guns deafen them, if not kill them outright, as the U.S.Department of Interior admits.

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The sound is 250 decibels or more, much louder than a jet engine.

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Dozens of melon-headed whales washed up dead on Madagascar beaches following similar seismic air gun testing by ExxonMobil in 2008.

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At new risk are cetaceans like the North Atlantic right whales.

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Five hundred or fewer remain.

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They'll have something like dynamite going off in their oceanic living room every 10 seconds for days or even weeks at a time now.

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Alternatives exist, from seafloor vibration-producers to revamped airguns that produce less sound but equally good images.

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Such choices might provide a little more peace and quiet in what's become a very noisy ocean

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For Scientific American 60-Second Earth. I'm David Biello.

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