New Water for a Thirsty World

acid acres addition amount areas atmosphere atoms become body carbon dioxide cause cent changes chemical chronic complete constituents contain continued cooling crystallization deposits depth dissolved drilling earth effect elements estimated excess exist fact faults feet field fissure five flow forest formed four gallons gases geologic ground water heat hundred hydrogen hydrothermal igneous rocks important increase indicate instance ions knowledge known land less liquid located magma materials means melting metals metamorphic MICHIGAN miles million minerals natural occur origin oxygen phase physical plants population possible precipitation present pressure primary water problems produced pumping quantities rain rainfall reaction referred region relatively result Riess rise River rocks salt says sodium soil solid solutions springs structure surface temperature thousand tion tons United water supply water vapor yield York