Habitat 1,724 Hail 216 HAIL 75 Hail clouds 141 Hail prevention 93 Hailstone growth 204 Hailstones 182 Hailstone structure 97 Halides 150 Halogenated hydrocarbons 480 Halogens 704 Handbooks 153 Hardness 97 Hardness tests 77 Haze 218 H chondrites 81 He-3 94 Health 407 Health and preventive medicine 102 Heard and McDonald Islands 123 Heat balance 924 HEAT BALANCE 91 Heat capacity 177 Heat exchange 682 Heat flow 1,043 Heat flux 1,477 Heating 1,013 HEATING 221 Heat loss 419 Heat pipes 197 Heat pumps 120 Heat recovery 202 Heat sources 146 Heat transfer 4,102 HEAT TRANSFER 763 Heat transfer coefficient 158 Heavy metals 492 Heavy minerals 159 Heavy water 136 Height finding 241 Heinrich events 440 Helicopter methods 92 Helicopters 443 Helium 184 Heterogeneity 290 Heterogeneous nucleation 574 HF communication 143 High-grade metamorphism 140 High pressure 138 High pressure ice 241 High pressure tests 144 High-resolution methods 971 High temperature 142 Highway planning 295 Highways 79 Himalaya Mountains 153 Himalayas--Garhwal 82 Histograms 172 Historical geology 352 History 2,986 Hoarfrost 409 Holocene 9,815 Homogeneous nucleation 128 Horizons 199 Host rocks 79 Hot oil lines 157 Hot spots 123 Hot springs 78 Houses 263 Human activity 3,272 Human ecology 811 Human factors 895 Human factors engineering 158 Humic substances 82 Humid environment 109 Humidity 1,409 Hummocks 436 Humus 99 Hydrates 596 Hydraulic conductivity 456 Hydraulic jets 134 Hydraulics 555 Hydraulic structures 1,436 Hydrocarbons 2,949 Hydrochemistry 2,042 Hydrodynamics 1,058 Hydroelectric energy 156 Hydrogen 1,143 Hydrogen bonds 436 Hydrogeochemistry 2,154 Hydrogeology 894 Hydrographs 413 Hydrography 1,294 Hydrologic cycle 955 Hydrology 9,422 Hydrostatic pressure 87 Hydrothermal alteration 127 Hydrothermal conditions 122 Hydrothermal processes 343 Hygroscopic water 100