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fracked well

PUMP DOWN  Hydraulic fracturing operations pump a mix of water, sand and other materials into the ground to ease the retrieval of oil and gas from the rock layers. New research is looking into the link between fracking and earthquakes.  

Earth's ionosphere

GLOWING HALO  The colorful bands above Earth’s surface, known as airglow, form when cosmic and solar rays interact with different gases in the upper atmosphere and emit light. Two upcoming NASA missions will study airglow and other properties of the ionosphere.


HOT SPOT  The Yellowstone supervolcano has a 17-million-year history of eruptions in the western United States. Now scientists say the source of the supervolcano’s heat isn’t a deep mantle plume, but the downward drag of an ancient subducting slab stirring up the mantle.

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