Potassium-40 can be used to date ________ that are ________ old.
A) volcanic rocks and associated 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 rocks and fossils; up to 75,000 years

Question

Quizplus · Accepted Answer

Potassium-40 has a half-life of 1.25 billion years and is commonly used to date volcanic rocks and associated fossils that are hundreds of millions of years old.

Potassium-40 Can Be Used to Date ________ That Are ________

Potassium-40 Can Be Used to Date That Are