PILLOWLAVA

Pillow lava

Pillow lavas are lavas that contain characteristic pillow-shaped structures that are attributed to the extrusion of the lava under water, or subaqueous extrusion. Pillow lavas in volcanic rock are characterized by thick sequences of discontinuous pillow-shaped masses, commonly up to one metre in diameter. They form the upper part of 'Layer 2' of normal oceanic crust.

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pillow lava

Noun

  1. The rock type, resembling pillows, typically formed when lava emerges from an underwater volcanic vent or a lava flow enters the ocean.
  2. A rock of that type.


The above text is a snippet from Wiktionary: pillow lava
and as such is available under the Creative Commons Attribution/Share-Alike License.

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