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Bighorn Canyon National Recreation Area

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Volcanic ash, pumice, and tephra ejected in volcanic eruptions ultimately falls back to Earth where it covers the ground. These deposits may be the thin dustings or may be many tens of feet (meters) thick near an eruptive vent. Volcanic ash and tephra can present geohazards that are present great di
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I Didn't Know That!: Biological Soil Crusts
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NPS Geodiversity Atlas—Bighorn Canyon National Recreation Area, Montana and Wyoming