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There are fifteen capital cities in the world in a position to be wiped out (19)
………..seriously damaged by volcanic eruptions. So why then (20) ……….. people
continue to live in (21) ………. dangerous areas? Many of these people are poor and have
(22) ……….. choice, while others disregard the risk, (23)…………. is, after all, rather (24)
…………. than the risks involved in smoking or driving a car. What attracts people to
volcanic areas (25) ………… fertile land. The soils from volcanic ashes are light, easily
worked, drain well and are full (26) ………… plant nutrients. A light fall of ash, (27)
…………… it may destroy one year’s crop, often pays the farmer (28) …………in future
years (29) …………. the fertility it adds to the soil. Coffee in Colombia, vines in Italy and
rice in Japan are (30) ………… a few of the crops that flourish on volcanic soils. In Italy,
Japan, New Zealand, the United States and Iceland the subterranean heat from volcanoes
(31) …………. used in geothermal power stations to generate electricity. In many places,
the way in which the flows of lava concentrate minerals (32) ……….. them attractive to
mining companies