Life Through Time: Geologic Time and Life

The video explains how Earth's 4.6 billion-year history is organized into geologic time, divided into eras, periods, and epochs. These segments are based on significant life changes, such as the Mesozoic Era, known as the age of reptiles, and the Cenozoic Era, known as the age of mammals.

What is the purpose of dividing Earth's history into segments?

What are the largest units of time on the geologic time scale called?

How are eras subdivided in the geologic time scale?

What significant changes are used to divide the segments of geologic time?

What are the names of the two eras mentioned in the text and their significance?