The oldest rocks on our crust are radioactively dated at about:
A)200 million years old.
B)one billion years old.
C)2.7 billion years old.
D)four billion years old.
E)4.6 billion years old.

Question

Quizplus · Accepted Answer

The oldest rocks on Earth, found in western Greenland, have been dated by four independent radiometric dating methods at approximately 3.8 billion years old. However, zircon crystals in Australia have been dated at about 4.4 billion years old, suggesting the presence of continental crust and water on the Earth's surface at that time. The choice of "four billion years old" is the closest approximation given the options.

The Oldest Rocks on Our Crust Are Radioactively Dated at About