Which graph below best represents the change in the proportion of unstable (parent) radioactive isotopes with time?

A. Graph a
B. Graph b
C. Graph c
D. Graph d


Answer: A

Environmental & Atmospheric Sciences

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Indicate whether the statement is true or false

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How do fossil fuels contribute to global warming?

A) Burning them breaks the carbon bonds releasing free carbon. B) Burning them breaks the sulfur bonds releasing free sulfur. C) Burning them breaks the nitrogen bonds releasing free nitrogen. D) They have no significant effect.

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Indicate whether the statement is true or false.

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