Geological Glossary

Glossary of common terms used in geology, and related to earth sciences.

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Sea Stack

Sea stack along Oregon’s northwest coast. Image from USGS Center for Coastal Geology. Sea Stack Sea stacks are blocks of erosion-resistant rock isolated from the land by sea. Sea stacks begin as part of a headland or sea cliff. Relentless pounding by waves erodes the softer, weaker parts of a rock first, leaving harder, more resistant rock behind.

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