Safety 2,671 Salinity 3,964 Sampling 2,819 Sand 1,153 SAR 1,036 Satellite methods 5,036 Satellites (artificial) 1,463 Sea ice 17,239 Sea ice distribution 3,792 Sea-level changes 2,570 Seasonal freeze thaw 877 Seasonal variations 11,165 Sea-surface temperature 1,463 Sea water 4,392 Sea water--Chemistry 1,683 Sedimentary rocks 3,150 Sedimentary structures 1,914 Sedimentation 5,784 Sedimentation rates 926 Sediments 18,325 Sediment transport 1,734 Seismic methods 2,543 Seismic profiles 1,148 Seismic surveys 1,944 Settlement (structural) 1,134 Ships 1,619 Shore features 1,286 Shores 1,099 Silicates 2,220 Simulation 4,309 Slope processes 1,254 Slopes 953 Slope stability 1,304 Snow 12,795 Snow accumulation 2,490 Snow composition 1,075 Snow cover 4,663 Snow cover distribution 3,705 Snow cover effect 2,404 Snow density 1,286 Snow depth 2,945 Snowdrifts 1,166 Snowfall 2,344 Snow hydrology 1,106 Snow loads 931 Snow mechanics 1,192 Snowmelt 3,740 Snow melting 951 Snow removal 2,041 Snow surveys 2,508 Snow water equivalent 2,353 Soil chemistry 1,818 Soil erosion 997 Soil formation 1,480 Soil freezing 2,716 Soil mechanics 3,398 Soil microbiology 981 Soil pollution 1,921 Soil profiles 1,007 Soils 9,144 Soil stabilization 986 Soil temperature 3,531 Soil tests 1,216 Soil water 1,554 Soil water migration 1,650 Solar radiation 2,778 Solifluction 955 Southern Alaska 929 Southern Ocean--Ross Sea 1,688 Southern Ocean--Weddell Sea 1,466 Spaceborne photography 2,654 Spatial distribution 2,554 Spatial variations 1,241 Spectra 3,078 Spermatophyta 1,175 Stability 1,398 Stable isotopes 6,355 Statistical analysis 9,807 Stony meteorites 951 Storms 1,144 Strains 1,319 Stratigraphy 3,905 Stratosphere 2,549 Strength 963 Stress 1,325 Stresses 2,310 Structural geology 994 Structures 1,922 Subantarctic regions 1,443 Subarctic regions 924 Subglacial environment 1,075 Subpolar regions 1,615 Surface temperature 961 Surface water 2,184 Surface waters 2,370 Surficial geology 1,259 Surveys 7,616 Swamps 2,115 Symposia 1,147 Synthetic aperture radar 1,956