Earth

  1. Earth

    Farmed salmon bring PCBs to the table

    High concentrations of chlorinated organic contaminants in farm-raised Atlantic salmon may warrant limiting consumption of the otherwise-healthful fish to no more than once per month.

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  2. Earth

    Air held oxygen early on

    Chemical analyses of South African sediments suggest that oxygen was present in small quantities about 2.32 billion years ago, which is at least 100 million years earlier than previously thought.

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  3. Earth

    Scooting on a Wet Bottom: Some undersea landslides ride a nearly frictionless slick of water

    New computer simulations suggest that hydroplaning may be responsible for the unexpectedly large distances traversed by some undersea avalanches.

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  4. Earth

    Two microbes team up to munch methane

    Aggregates of two different microorganisms in methane-bearing ocean sediments collected off the Oregon coast appear to collaborate to consume methane despite a lack of oxygen.

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  5. Earth

    Even Nunavut gets plenty of dioxin

    Within a few weeks, some of the dioxin generated by industrial activities in the United States and Mexico falls out in the high Arctic.

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  6. Earth

    Bogged Down: Ancient peat may be missing methane source

    Massive peat bogs in Russia may have been a major source of atmospheric methane just after the end of the last ice age.

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  7. Earth

    This pollutant fights lupus

    A hormone-mimicking pollutant that leaches out of some plastics appears to fight lupus.

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  8. Earth

    When testosterone gets down and dirty

    Testosterone excreted by livestock can pass through soils, which may explain new findings of fish-altering hormonal activity in water downstream of cattle feedlots.

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  9. Earth

    Infrasonic Symphony

    Scientists are eavesdropping on volcanoes, avalanches, earthquakes, and meteorites to discern these phenomena's infrasound signatures and see what new information infrasound might reveal.

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  10. Earth

    Blasts from the Past: Orbiting radar spots old nuclear-test sites

    A technique that analyzes satellite images to detect subtle ground motions often can perceive subsidence over underground nuclear-test sites, sometimes even if those tests occurred decades ago.

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  11. Earth

    My Own Private Bad-Air Day: Outdoor data underrate pollutant exposure

    Most people breathe in substantially more organic contaminants than airborne concentrations of such substances in their homes and communities would suggest.

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  12. Earth

    New technique dates glaze on desert rocks

    Scientists have developed a quick, easy, portable, and nondestructive way to determine the age of desert varnish, the mysterious dark coating that slowly develops on rocks in many arid regions of the world.

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