Gamma irradiation 273 Gases 624 Gas hydrates 537 Gas pipelines 704 Gas production 272 General circulation models 1,258 Genetics 545 Geochemical cycle 1,632 Geochemical cycles 1,981 Geochemistry 8,736 Geochronology 4,799 Geocryology 2,620 Geodesy 604 Geodetic surveys 263 Geographic information systems 1,060 Geography 413 Geological maps 369 Geological surveys 1,066 Geologic hazards 2,680 Geologic processes 368 Geologic structures 481 Geology 1,286 Geology--Maps and charts 894 Geomagnetic disturbances--Bays and pulsations 431 Geomagnetic disturbances--Storms 310 Geomagnetic field 265 Geomagnetic field--Anomalies 350 Geomagnetism 824 Geometry 310 Geomorphology 7,033 Geophysical methods 4,869 Geophysical profiles 1,093 Geophysical surveys 4,532 Geophysics 562 Glacial deposits 5,532 Glacial environment 6,039 Glacial erosion 1,841 Glacial extent 949 Glacial features 5,448 Glacial geology 18,078 Glacial geology maps 270 Glacial hydrology 3,096 Glacial lakes 1,431 Glacial meteorology 703 Glacial rebound 527 Glacial rivers 941 Glacial sedimentation 1,369 Glacial till 356 Glacial transport 420 Glaciation 7,463 Glacier ablation 2,024 Glacier alimentation 361 Glacier beds 584 Glacier flow 4,950 Glacier heat balance 299 Glacier ice 2,605 GLACIER ICE 292 Glacier ice--Flow 422 Glacier mass balance 2,010 Glacier melting 983 Glacier oscillation 3,058 Glaciers 9,592 Glacier surfaces 816 Glacier surges 734 Glacier surveys 2,756 Glacier thickness 676 Glacier tongues 392 Glaciofluvial environment 502 Glaciolacustrine environment 403 Glaciology 1,863 Glaciomarine environment 986 Glaciomarine sedimentation 262 Glaze 289 Global 1,164 Global change 4,816 Global Positioning System 816 Global warming 4,111 Globigerinacea 292 Gneisses 264 Gondwana 612 Government agencies 558 Grain size 2,047 Granites 313 Grasses 510 Gravel 813 Gravity 860 Gravity anomalies 304 Gravity methods 398 Greenhouse effect 1,005 Greenland--Greenland ice sheet 1,078 Greenland Sea 354 Greenland--Summit 299 Grounded ice 274 Ground ice 3,912 GROUND ICE 322 Ground-penetrating radar 575 Ground thawing 2,333 Ground water 3,489 Growth 978 Gymnospermae 572