Select the correct responses to the questions from the drop-down menu. What did scientists study to develop the geologic time scale? Which division of the geologic time scale includes most of Earth's history?

1. scientists first devoloped the geologic time scale by studying rock layers and index fossils worldwide. with this information,scientists placed earth's rock layers in order by relative age. Later, rafio active dating helped determine the absoulte age of divisons in the geologic scale.

2. Eons are the largest intervals of geologic time and are hundreds of millions of years in duration. in the time scale above you can see the phanerozoic Eon is the most recent eon and began more than 500 million years ago. Eons are divided into smaller time intervales known as eras.

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1. fossils

2.precambrian

Explanation:

What did scientists study to develop the geologic time scale?

✔ fossils

Which division of the geologic time scale includes most of Earth’s history?

✔ Precambrian

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