Question

What main criterion determines major divisions in the geologic time scale?

A. shifts in the position of Earth in its orbit

B. the occurrence of huge events in Earth's natural history

C. different stages in human evolution

D. times of major climate change

Answer 1

The answer is B. the occurrence of huge events in Earth's natural history

The geologic time scale is a system of chronological dating that relates geological strata to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.