12. Why do you have to use uranium-238 to measure the half life of a rock? * 1 point
All non- living things contain uranium - 238 and the amount begins to increase when
the rock comes to the surface.
All non- living things contain uranium - 238 and the amount begins to decrease when
the rock comes to the surface.
All non- living things contain carbon - 14 and the amount begins to decrease when
the rock comes to the surface.
All non- living things contain carbon - 14 and the amount begins to increase when



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