The two correct answers you could determine by reading the geologic time scale are:
- The number of eras in Earth's history
- The events that ended major divisions of geologic time
The geologic time scale provides a framework for understanding the Earth's history and the significant events that have shaped it, including the boundaries between different eras. While it also relates to the age of Earth and life forms, the specific facts listed align better with the structure and events in the geologic time scale itself.