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Scoria Volcanic Rock | by Martin_Heigan
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Scoria Volcanic Rock

A macro photograph of a Scoria Volcanic Rock from the eruption in 1814 of Mount Mayon (Albay Province, Bicol Region, on the large island of Luzon in the Philippines).

 

The holes were formed by gas bubbles.

 

Martin

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Taken on October 23, 2018