If three samples have the half-lives listed below, which sample would remain radioactive the longest?
A. a sample with a half-life of 20 million years
B. a sample with a half-life of 20 hours
C. a sample with a half-life of 20 minutes
D. a sample with a half-life of 20 years
E. none of the above
Answer: A
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Most of the radiant energy emitted by Earth is in the form of ________ radiation
Fill in the blank(s) with the appropriate word(s).
In middle latitudes, rain:
A) usually begins as snow. B) is formed by the collision-coalescence process. C) is less common than in high latitudes. D) is incapable of turning to sleet.
Excess amounts of CO2 in the atmosphere have led to ocean ____________ as the oceans absorb CO2 and convert it to H2CO3.
Fill in the blank(s) with the appropriate word(s).
A raccoon spends its week eating raspberries, grain, eggs, and grasshoppers. Raccoons are therefore
A) carnivores. B) omnivores. C) herbivores. D) producers.