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Earth & Environment

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map of Earth

FULL OF PLATES  Earth’s outer crust is composed of more than a dozen large pieces, known as tectonic plates, which bump or slide against each other.

March hydroxyl distribution

RADICAL THEORY  Changes in the concentration of a highly reactive compound in the atmosphere called hydroxyl may be to blame for a rise in global methane levels since 2007, new research suggests. Redder regions in this simulation of a typical March hydroxyl distribution contain higher concentrations of the molecule.

Arctic expedition

HIDDEN HEAP  A recent expedition to the Arctic found that some areas of the seemingly pristine waters, particularly around Greenland and in the Barents Sea, are littered with copious amounts of plastic debris.

Earth & Environment

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