Ключевые слова: air pollution, architecture, building, cancer illness, city, city map, concepts, crack, cracked, crevice, danger, earth, environmental conservation, erupting, escape, escaping, fissure, gas, grounds, growth, ideas, inhaling, land, lung cancer, map, natural gas, natural phenomenon, no people, planning, protection, radiation, radioactive contamination, radon, radon gas, radon test, rift, risk, soil, splitt, town, turf, underground, water pollution,