What is the main use of radioisotopes?
A) to determine the age of fossils
B) as garden insecticides
C) to stop pollution
D) as agricultural herbicides
Correct Answer:
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Q63: Which matter is broken down by biological
Q65: Which type of radiation is most penetrating?
A)alpha
B)gamma
C)beta
D)ultraviolet
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Q69: What is given off by natural radioactivity?
A) delta
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Q77: What best characterizes Earth's closed system?
A) matter and
Q80: Which statement about nuclear fusion is correct?
A) High-temperature
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