East Pacific Rise pillow basalt

  • Exhibition Text

    • This sample illustrates the hollow nature of many pillow basalts. The pillow inflates from the magma’s pressure, but when the eruption cases, some magma drains back, creating an interior cavity. The pillow cools and contracts, forming fractures that radiate from the interior.

      Loaned by the Scripps Institute of Oceanography

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  • For Educators

    • Topic: Earth Science

      Subtopic: Volcanoes

      Keywords: Ocean bottom, Volcanoes, Basalt, Magmas, Mid-ocean ridges, Lava

      Audience: General