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The unstable isotope nickel-59 can be used to date rocks that contain it. Nickel-59 decays into the more stable cobalt-59. The nickel Isotope has a
half-life of 76,000 years. Which statement about nickel-59 is true?
ОА.
After 76,000 years, all the nickel-S9 in a rock decays into cobalt-59.
OB. Nickel-59 can only be used to date rocks that are younger than 76,000 years.
Oc. All the nickel-59 stabilizes after it completes one half-life period of 76,000 years.
OD. The amounts of nickel-59 and cobalt-59 remain the same over a half-life period.
OE. The amounts of nickel-59 and cobalt-59 tell how long ago the rock cooled to closure temperature.
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