... 136 – 138 , 148characteristics 130 , 131 and climate change 148–151conservation 1 43 144desalination 142–1 43, 154digging wells 139 –142droughts 129 Earth s amounts of 131 human needs 130 – 131 hydrologic ... 130 – 131 hydrologic modeling and prediction 145, 145–146origins of 131 – 132 pollution 139 rainfall distribution 132 , 132 mshortages 128– 130 , 139 , 140–141water cycle 133 – 139 , 134 waterborne illnesses ... 101hot springs and geysers 72, 72, 101, 1 03, 109humidity 135 hydrology 132 , 133 IIceland 72, 1 03, 1 03, 107, 107, 109, 110–111, 124Idaho 111, 121, 124Ide, Satoshi 176, 180Illinois earthquake...