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Scoria, Craters of the Moon National Park & Preserve, 2013.

Scoria, Craters of the Moon National Park & Preserve, 2013.

Scoria used to be called cinder. This pyroclastic rock is made mostly of volcanic materials. Pyroclasts range from the largest agglomerates to very fine ash. These different sizes are classified as volcanic bom... More

Unusual Volcanic Pyroclastic Deposits on Io

Unusual Volcanic Pyroclastic Deposits on Io

Unusual Volcanic Pyroclastic Deposits on Io NASA/JPL/USGS

Aristarchus Plateau 2: Pyroclastic Deposit

Aristarchus Plateau 2: Pyroclastic Deposit

Part of the vast pyroclastic deposit located on the Aristarchus plateau is visible in this image taken by NASA Lunar Reconnaissance Orbiter. NASA/GSFC/Arizona State University