pillow lava

noun

Definition of pillow lava

: lava commonly basaltic in type that is congealed in rounded masses suggestive of pillows and is believed by most geologists to be indicative of submarine eruption or flow

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“Pillow lava.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pillow%20lava. Accessed 31 Oct. 2020.

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