ENVIRONMENTAL SCIENCE
54. A sample of radioactive waste has a half-life of 10 years and an activity level of 2 curies. After how many years will the activity level of this sample be 0.25 curie? (A) 10 years (B) 20 years (C) 30 years (D) 40 years (E) 80 years. 55. The most abundant gas in Earth's atmosphere is (A) nitrogen (B) oxygen (C) water vapor (D) carbon dioxide ................
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