Isochron Diagrams

5. Why does mineral M3 move up and to the left faster than mineral M2, and M2 faster than M1?
  Mineral M3 started out with more daughter isotopes than M2 or M1.
  Mineral M3 contains parent isotopes that have a shorter half-life than M2 or M1.
  Mineral M3 started out with more parent isotopes than M2 or M1.

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