Beautiful layering of volcanic ash on #GranCanaria, it consists of fragments of erupted material (size <2mm) #geology @GeoTenerife @involcan http://pic.twitter.com/5XZJWgf66t
— Malte Froemchen (@Malte_Geology) June 28, 2017
via Twitter https://twitter.com/Malte_Geology
June 29, 2017 at 03:30AM
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