P: P-wave P-wave shadow zone Pacific Mountain System Pacific Ocean Pacific Plate packing pahoehoe Pakistan paleoclimate paleogeography paleomagnetism paleontologist paleontology paleoseismicity Paleozoic Paleozoic Era Palos Verdes Peninsula Panam Crater Pangaea Pangea paper record parent rock park Parkfield Parkfield study goal Paseo del Mar Paul Reasenerg peak acceleration pearl peat pebble pebbly sand pedogenic pelagic pelican peneplain Pennsylvanian percent g percolation perennial stream period permanent magnetic field permeability Permian Perry Ehlig petroleum reservoir petrologist PGA phaneritic Phanerozoic Eon Phanerozoic Era phenocryst phosphate phosphorous photo-voltaic cell photosynthesis phyllite phylogenetics physical material physical property physicist physics physiographic feature Pierre Perrault Pierre-Simon LaPlace pillow lava pine tree PING plagioclase plain plane plane of slip planet planetary accretion planetary formation planetary motion plankton plant plastic deformation plate plate boundary plate margin plate motion plate tectonic plate tectonics plateau platform playa Pleistocene Pleistocene Epoch Pleistocene Period Pliocene plug pluton plutonic point bar Point Barrow Point Fermin Poisson distribution polar polar ice melting polarity policy pollen pollution polygon pond poor sorting pore space porosity port Portuguese Bend positioning potassium potential energy power prairie Precambrian precious metal precipitation precision predation prediction preservation pressure pressure release primary wave Princeton Principle of Original Horizontality Principle of Cross-cutting Relationships Principle of Faunal Succession Principle of Original Horizontality Principle of Superposition Principle of Uniformity Principles of Relative Age Dating process production progradation project project name projection prokaryotic Proterozoic Eon proto-ocean crust protocontinent protolith proton precession magnetometer public health public land use policy pumice punctuated equilibrium pyrite pyroclastic pyroxene
U.S. Department of the Interior | U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/P_keywords.html Page Contact: InfoBank staff Page Last Modified: Tue Dec 16 06:27:35 PST 2008 (wcs)