Beasley River Lava (IMAGE)

University of Washington

Beasley River Lava

Caption

One of the lava flows analyzed in the study, from the shore of Australia's Beasley River. Gas bubbles that formed as the lava cooled, 2.7 billion years ago, have since filled with calcite and other minerals. The bubbles now look like white spots. Researchers compared bubble sizes from the top and bottom of the lava flows to measure the ancient air pressure.

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Sanjoy Som/University of Washington

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