Encyclopedia of Earth and Physical Sciences - Vol. 9

Encyclopedia of Earth and Physical Sciences - Vol. 9

Encyclopedia of Earth and Physical Sciences - Vol. 9

Encyclopedia of Earth and Physical Sciences - Vol. 9

Excerpt

CONTENTS

Paleontology 1157

Paleozoic era 1163

Pangaea 1165

Particle accelerators 1167

Particle physics 1169

PCBs (polvchlorinated biphenyls) 1175

Pennsylvanian period 1177

Periodic table 1181

Permafrost 1186

Permian period 1188

Petrochemicals 1194

Phase transitions 1200

Phenols 1202

Phosphorus 1204

Photoelectric effect 1206

Photography 1208

Physical chemistry 1214

Physics 1218

Piezoelectricity 1226

Planet X 1228

Plasma 1229

Plastics 1230

Plate tectonics 1236

Platinum metals 1241

Pluto 1243

Plutonium 1245

Polarity 1247

Polarization 1249

Polar regions 1252

Pollution 1255

Polymers 1259

Precambrian 1263

Precipitation 1266

Proteins 1269

Protcrozoic eon 1271

Protons 1274

Pulsars 1276

Purines and pyrimidines 1278

Quantum theory 1280

Quarks 1287

Quartz 1291

Quasars 1293

Index 1295

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