... 71, 81, 91 92, 10 1hot springs and geysers 72, 72, 10 1, 10 3, 10 9humidity 13 5hydrology 13 2, 13 3IIceland 72, 10 3, 10 3, 10 7, 10 7, 10 9, 11 0 11 1, 12 4Idaho 11 1, 12 1, 12 4Ide, Satoshi 17 6, 18 0Illinois ... 10 6, 10 9, 11 1, 12 1, 12 3, 12 4San Andreas Fault 16 7, 16 8, 16 9m, 17 0, 17 0, 18 1, 18 4, 18 6San Andreas Fault Observatory at Depth (SAFOD) 18 1 18 3California Geological Survey 16 0, 17 7, 18 1California ... 18 19 , 30– 31, 10 9 11 2droughts 12 9, 13 9, 14 0 14 1, 14 6 14 7, 14 9, 15 0 15 1, 15 3dry steam power plants 10 4, 10 5 10 6dust bowl (19 30s) 14 0 14 1, 15 0, 15 3dynamo theory 47– 51 E Earth facts. See...