Discussion
The age of most ancient geological formation is estimated by?
Answer: D
The most ancient geological formations are dated by the uranium–lead method, which is good to about 4,500 million years.
Uranium-238 decays to lead-206 with a half-life of 4,470 million years, so the ratio of the two dates the rock. Carbon-14, with a half-life of 5,730 years, is useless beyond about 50,000 years and works only on once-living material.
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