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Earth & Environment

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Scott Jasechko

DEEP WATER  Deep groundwater wells, such as this hand-pumped well in Uganda being operated by water resources scientist Scott Jasechko, can contain mixes of old and young water and traces of pollution.

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.

Earth & Environment

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