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kay20213 kay20213
wrote...
6 years ago
Because we know that the half-lives of many radioactive isotopes are millions of years, we can deduce that
 a. the longer it exists the more radioactive nuclei Earth produces.
  b. the sun is the source of all the radioactive nuclei on Earth.
  c. there must have been many more radioactive nuclei on Earth when life began.
  d. there must have been far fewer radioactive nuclei on Earth before life began.
  e. the natural radioactivity of minerals on the Earth was created by the Earth's internal temperature.
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6 years ago
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