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

question 16

Multiple Choice

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

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Definitions:

Kilometers

A unit of length in the metric system equal to 1000 meters.

Miles

A unit of distance or length measure equal to 5,280 feet or approximately 1.609 kilometers, used mainly in the United States.

Square

A polygon with four equal sides and four right angles; also, the mathematical operation of multiplying a number by itself.

Dimensional-analysis

A method in physics and engineering to check the consistency of equations involving physical quantities by tracking units and dimensions.