Question

1. choose the correct answer.

radiocarbon dating was developed in 1949 by ______.
○ libby
○ sargon
○ darwin
○ descartes

1. choose the correct answer.

______ measures the amount of argon present in a rock.
○ date markers
○ potassium-argon dating
○ stratigraphy
○ radiocarbon dating

Explanation:

Question 18

Radiocarbon dating was developed by Willard Libby in 1949. Sargon was an ancient ruler, Darwin is known for evolution theory, and Descartes was a philosopher/mathematician, so they are not related to radiocarbon dating development.

Potassium - Argon dating is a method that measures the amount of argon (formed from potassium decay) in a rock to determine its age. Date markers are not a dating method, stratigraphy studies rock layers, and radiocarbon dating is for organic materials, not measuring argon in rocks.

Answer:

A. Libby

Question 19