... 31, 33W Zwadis 46 waste 122water 11, 64 65 , 96 groundwater 67 , 68 , 75, 78superheated 34, 35water cycle 66 67 waterfalls 71waterspouts 91water table 67 water vapor 64 , 65 , 87early atmosphere ... 45silver 41single-celled organisms 96, 98sinkholes 78slash and burn farming 114slate 56, 57snow 66 , 67 , 87soil 60 61 , 69 , 122solar energy 92solar system 9, 10–11, 12, 64 Sonoran Desert ... 87early atmosphere 17, 80water cycle 19, 66 waves 47, 48, 82–83weather 65 , 86 87extreme 90–91weather forecasting 87weathering 46 47, 60 wetlands 65 , 104–105whales 100, 101Whin Sill 45whirlpools...