Asked by Kalie


_____ is useful for dating very old rocks because it has a half-life of 1.3 billion years.

A. thorium-232

B. potassium-40

C. uranium-235

D. carbon-14

is the answer D?
Answered by Ms. Sue
http://www.google.com/#q=half-life%2Bof%2B1.3%2Bbillion%2Byears

http://www.google.com/#q=carbon+14+half+life
Answered by phill
potassium-40
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