Question
Which best describes eras and periods?
Eras have a smaller time span than periods.
Eras and periods are independent of each other.
Eras and periods both appear at the start of the Cambrian period.
Eras were more recently established on the time scale than periods.
Eras have a smaller time span than periods.
Eras and periods are independent of each other.
Eras and periods both appear at the start of the Cambrian period.
Eras were more recently established on the time scale than periods.
Answers
GPT-4o mini
The best description among the options provided is:
**Eras were more recently established on the time scale than periods.**
In geology, eras are larger divisions of geologic time that encompass multiple periods, which are smaller subdivisions within those eras. Thus, periods are older terms in the geologic time scale compared to eras.
**Eras were more recently established on the time scale than periods.**
In geology, eras are larger divisions of geologic time that encompass multiple periods, which are smaller subdivisions within those eras. Thus, periods are older terms in the geologic time scale compared to eras.