Question

Why are time periods on the geologic time scale not even in length?(1 point) Responses They are based on the thickness of the Earth's rock layers. They are based on the thickness of the Earth's rock layers. They are based on a different type of calendar used to track Earth’s history. They are based on a different type of calendar used to track Earth’s history. They are based on important events that happened in Earth’s history. They are based on important events that happened in Earth’s history. They are based on the type of fossils found in rock layers of the Earth

Answer 1

The correct response is: They are based on important events that happened in Earth’s history.

The geologic time scale is divided into eons, eras, periods, epochs, and ages, which are not of equal length because they reflect significant geological and biological events, such as mass extinctions and major changes in fossil records.