Question

studies of sedimentary rocks and fossils have helped scientists understand the history of earth. how is geologic time organized on the geologic time scale? periods and then smaller eras based on geologic and biologic events that occurred during those times eras and then smaller periods based on geologic and biologic events that occurred during those times eras and then smaller millennia based on geologic and biologic events that occurred during those times millennia and then smaller periods based on geologic and biologic events that occurred during those times

Explanation:

The geologic time scale is organized by dividing time into eras, which are then further divided into smaller periods. These divisions are based on significant geologic (such as major mountain - building events, volcanic activities, or changes in the Earth's climate) and biologic events (like mass extinctions, the evolution of new species, or the dominance of certain life forms) that occurred during those times.

Answer:

eras and then smaller periods based on geologic and biologic events that occurred during those times