Explain what geologists are, and what do they have to do with a calendar of Earth's geology history? HURRY PLEASEE!!

Using dazzling detective skills, geologists created a calendar of geologic time. They call it the Geologic Time Scale. It divides Earth's entire 4.6 billion years into four major time periods. The oldest — and by far the longest — is called the Precambrian

Explanation:

i believe the answer is a or 1

bc blah

explanation:

bc blah