why is there still radioactive material on earth? Why hasn’t it all decayed?
In: 16
Different substances decay at different rates. Some only exist in the lab for many times less than microseconds. Some exist longer than the age of the universe.
[https://en.wikipedia.org/wiki/List_of_radioactive_nuclides_by_half-life](https://en.wikipedia.org/wiki/List_of_radioactive_nuclides_by_half-life)
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