What property of half-lives makes radioactive material so problematic?
A. There is no known way to shorten a half-life.
B. Radioactivity is limited by the natural decay time to stable isotopes.
C. There is no known way to measure half-lives with any accuracy.
D. All half-lives are long.
E. both A and B
Answer: E
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A mineral deposit can be classified as an ore deposit when
A. it contains valuable gemstone quality minerals. B. it contains valuable fossil fuels. C. valuable metals are present in the deposit. D. valuable metals in the deposit can be mined at a profit.
Which sediment is categorized under cosmogenous sediments?
A) Evaporites B) Ooliths C) Microtektites D) Manganese nodules
One conservation method used to protect turtles from trawl nets uses ________.
A. sonar B. acoustic tagging devices C. turtle excluder devices (TEDs) D. gill nets
Gross National Income (GNI) is the total income of a country's residents, no matter where it comes from
Indicate whether the statement is true or false.