Pack ice 1,182 Paleoatmosphere 606 Paleobotany 685 Paleocirculation 679 Paleoclimatology 14,173 Paleoecology 3,183 Paleoenvironment 4,674 Paleogene 1,472 Paleogeography 2,209 Paleohydrology 685 Paleomagnetism 1,629 Paleontology 1,190 Paleo-oceanography 2,907 Paleotemperature 2,357 Paleozoic 2,382 Palynomorphs 2,489 Particles 727 Particle size distribution 676 Patterned ground 838 Patterns 716 Pavements 1,244 Peat 2,421 Performance 670 Periglacial environment 759 Periglacial features 2,934 Periglacial processes 1,290 Periodic variations 812 Permafrost 13,827 Permafrost beneath structures 2,546 Permafrost distribution 2,265 Permafrost hydrology 2,766 Permafrost physics 560 Permafrost preservation 586 Permafrost structure 1,171 Permafrost thermal properties 1,379 Permafrost thickness 882 Permeability 936 Permian 612 Petrography 801 Petroleum 1,999 Petroleum exploration 946 Petroleum industry 882 Petrology 2,348 PH 850 Phase transformations 2,093 Photochemistry 776 Photointerpretation 701 Photosynthesis 1,436 Physical properties 2,370 Physiology 1,275 Physiology--Human 588 Phytoplankton 1,355 Pigments 956 Piles 749 Pipelines 1,865 Pisces 1,251 Pisces--Physiology 845 Planar bedding structures 829 Planets 1,633 Plankton 3,439 Planktonic taxa 660 Plankton--Phytoplankton 990 Planning 633 Plantae 5,583 Plant ecology 4,295 Plant physiology 1,569 Plants (botany) 822 Plate tectonics 1,974 Pleistocene 10,356 Pliocene 1,074 Plutonic rocks 1,305 Polar atmospheres 3,202 Polar regions 1,681 Polar stratospheric clouds 647 Pollen 1,783 Pollutants 2,117 Pollution 4,306 Polymers 714 Polynyas 1,051 Porosity 1,215 Porous materials 611 Power line icing 868 Precambrian 1,741 Precipitation 588 Precipitation (meteorology) 9,909 Prediction 2,792 Pressure 1,490 Pressure ridges 820 Preventive measures 618 Primary productivity 1,262 Processes 1,452 Productivity 1,962 Profiles 1,936 Programs 1,607 Properties 636 Protection 1,406 Proterozoic 1,122 Protista 2,763 Provenance 1,151 Pyroclastics 601