Answer:
Why do geologists use the geologic time scale?
Because of the time span of Earth's past is so great, geologist use geologic time scale to show Earth's history.
What is the geologic time scale?
The geologic time scale is a record of the geologic events and the evolution of life forms as shown in the fossil record.
How do scientists develop the geologic time scale?
Scientists first developed the geologic time scale by studying rock layers and index fossils worldwide. With this information,scientists placed Earth's rocks in order by relative age. Later, radioactive dating helped determine the absolute age of the divisions in the geologic time scale.
What do the divisions of geologic time scale depend on?
The divisions of the geologic time scale depend on events in the history of life on Earth.
Hope these help, :)
Answer:
fossils
Explanation:
they used rocks which are fossils
