Potassium-40 can be used to date ________ that are ________ old.
A. fossils; thousands of years
B. volcanic rocks and associated fossils; hundreds of millions of years
C. potassium-rich fossils; millions of years
D. carbon-containing materials; up to 75,000 years
Answer:B
Potassium-40 can be used to date ________ that are ________ old.
A. fossils; thousands of years B. volcanic rocks and associated fossils; hundreds of millions of years C. potassium-rich fossils; millions of years D. carbon-containing materials; up to 75,000 years