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Geology
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Alphabetical index
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Paleocene
The Paleocene epoch is the first geological epoch of the ...
Paleomagnetism
Paleomagnetism is the the study of recordings of the Earth's ...
Paleozoic
The Paleozoic era was the second geological era of life on ...
Paragenesis
Paragenesis is the clustering of minerals associated in time ...
Passive continental margin
A passive continental margin is a submerged continental ...
Patina
Patina is the weathering of the surface of rocks; patina ...
Pedogenesis
Pedogenesis is all the physical, chemical and biological ...
Pegmatitoid
Pegmatitoid rock is pegmatic rock without quartz, with ...
Peridotite
Peridotite is ultrabasic coarse-grained igneous rock ...
Perigranitic
Perigranitic rock is a vein of igneous rock, a vein of ...
Permafrost
Permafrost is perpetually frozen ground in Arctic areas.
Permafrost
Permafrost is soil (or rock) that remains at a temperature ...
Permian
The Permian period is the sixth geological period of the ...
Perovskite
Perovskite is a mineral compound of calcium and titanium ...
Petrified
Petrified means changed into stone; an organic body is ...
Phanerozoic
The Phanerozoic is the fourth geological eon. It extends ...
Phosphates
Phosphates are sedimentary rocks formed from amorphous or ...
Phreatic
Phreatic refers to an eruption in which the explosive ...
Phyllosilicates
Phyllosilicates are silicates composed of sheets of SiO4 ...
Pisolitic
The adjective "pisolitic" denotes mineral ...
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