Which geological time period is referred to by geologists as the oldest portion of Earth's history, accounting for roughly 87% of that history?
A)Triassic period
B)Pleistocene epoch
C)Paleozoic era
D)Precambrian eon

Question

Quizplus · Accepted Answer

The Precambrian eon is the oldest portion of Earth's history and accounts for roughly 87% of that history. It is divided into three sub-eons: the Hadean, Archean, and Proterozoic. The other options are not as old as the Precambrian eon.

Which Geological Time Period Is Referred to by Geologists as the Oldest