Pack ice 1,217 Paleobotany 1,105 Paleoclimatology 14,675 Paleoecology 3,154 Paleoenvironment 4,139 Paleogene 921 Paleogeography 1,585 Paleohydrology 543 Paleomagnetism 1,277 Paleontology 1,914 Paleo-oceanography 2,280 Paleotemperature 1,847 Paleozoic 1,248 Palynology 526 Palynomorphs 1,802 Particles 695 Particle size distribution 777 Patterned ground 866 Pavements 1,275 Peat 2,340 Pedology 554 Performance 709 Periglacial environment 576 Periglacial features 1,719 Periglacial processes 1,988 Periodic variations 1,100 Permafrost 11,712 Permafrost beneath structures 2,699 Permafrost depth 621 Permafrost distribution 2,611 Permafrost hydrology 2,895 Permafrost physics 802 Permafrost preservation 694 Permafrost structure 1,380 Permafrost thermal properties 1,574 Permafrost thickness 987 Permeability 868 Petroleum 1,677 Petroleum exploration 824 Petroleum industry 944 Petrology 3,870 PH 666 Phase transformations 2,218 Photochemistry 737 Photography 539 Photointerpretation 779 Photosynthesis 1,437 Physical properties 2,174 Physiology 1,271 Physiology--Human 588 Phytoplankton 1,289 Pigments 918 Piles 661 Pipelines 1,792 Pisces 1,187 Pisces--Morphology 525 Pisces--Physiology 847 Planar bedding structures 579 Planets 1,316 Plankton 3,668 Plankton--Phytoplankton 1,047 Planning 613 Plantae 4,357 Plant ecology 4,338 Plant physiology 1,590 Plants (botany) 844 Plant tissues 527 Plate tectonics 1,033 Pleistocene 9,776 Pliocene 698 Plutonic rocks 596 Podsol 540 Polar atmospheres 3,355 Polar regions 1,652 Polar stratospheric clouds 666 Pollen 1,492 Pollutants 1,876 Pollution 3,846 Polymers 721 Polynyas 1,074 Porosity 1,133 Porous materials 600 Power line icing 868 Precambrian 1,131 Precipitation 553 Precipitation (meteorology) 9,010 Prediction 2,534 Prefabrication 560 Pressure 1,148 Pressure ridges 836 Preventive measures 586 Primary productivity 1,380 Processes 564 Productivity 1,849 Profiles 1,916 Programs 1,432 Protection 1,399 Proterozoic 830 Protista 1,770 Provenance 705