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Pegmatite Pegmatite is igneous rock occurring in the form of seams or ...
Phonolite Phonolite is volcanic rock under-saturated in silica ...
Pillow lavas Pillow lavas are formed underwater. They take the shape of a ...
Plagioclasite Plagioclasite is a synonym of anorthosite (q.v.).
Planèze Planèze is a French term meaning a volcanic plateau.
Plinian spine A Plinian spine is one of the two main explosive regimes, ...
Porphyric Porphyric rocks are igneous rocks containing large crystals ...
Protrusion A geological protrusion forms during a volcanic eruption ...
Pyroclastic flow A pyroclastic surge is a relatively dense high temperature ...
Pyroclastic surge A pyroclastic surge is a large volume of burning gases at ...
 
 

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