About how old is the oldest craton within the North American continental shield?
A) Greater than 2.5 billion years old.
B) About 2 billion years old.
C) About 1 billion years old.
D) Less than 1 billion years old.

Question

Quizplus · Accepted Answer

The oldest craton within the North American continental shield, the Canadian Shield, is greater than 2.5 billion years old. Cratons are ancient and stable parts of the continental lithosphere.

About How Old Is the Oldest Craton Within the North