Bighorn Canyon National Recreation Area
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3 페이지큐레이터: Up for Grabs업데이트
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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
버전: 2관리자: 1컬렉션: 0CC0 1.0 — public domain
