(Question)
Q: What is required for a decay chain to end? Choices: - stable half-life - unstable end-product - radioactive cascade - stable end-product A:
(Answer)
stable end-product

(Question)
Q: What phenomenon has severe consequences on both natural and man-made objects, including killing trees and degrading marble statues? Choices: - carbon rain - oxygen rain - natural rain - acid rain A:
(Answer)
acid rain

(Question)
Q: A binary molecular compound is made up of two of what? Choices: - compounds - cells - wafers - elements A:
(Answer)
elements