... 67volcanoes 6–7, 10, 16, 20, 21, 30 31 , 58eruptions 17, 32 33 , 80explosions 31 , 33 W Zwadis 46waste 122water 11, 64–65, 96groundwater 67, 68, 75, 78superheated 34 , 35 water cycle 66–67 waterfalls ... 50, 52– 53, 54, 97frost-shattering 46, 47fuels 116, 122fungi 97, 98Ggabbro 43, 57galaxy 8–9garbage 122gas 116Gaspra 12gemstones 38 39 , 43, 57, 117geothermal energy 35 geysers 34 35 giant ... one.TROPICS The hot regions to the north and south of the equator, between the Tropic of Cancer and the Tropic of Capricorn.TROPOSPHERE The lowest layer of the Earth s atmosphere.TSUNAMIA fast-moving...