In the 19th century, the famous physicist Lord Kelvin estimated the age of Earth to be much much less than its present estimate. What information did Kelvin not have to account for his error?
A. Lord Kelvin was not aware of radioactive decay, a source of energy to keep Earth warm for billions of years.
B. Lord Kelvin knew only classical physics and had no knowledge of anthropological dating.
C. Lord Kelvin never gave any estimate of the age of Earth.
D. Lord Kelvin had no knowledge of radio waves for measuring distance and age of planets since they have not yet been introduced into science.
Answer: A
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