Question
Why are time periods on the geologic time scale not even in length?
A. They are based on important events that happened in Earth’s history.
B. They are based on the type of fossils found in rock layers of the Earth.
C. They are based on a different type of calendar used to track Earth’s history.
D. They are based on the thickness of the Earth's rock layers.
A. They are based on important events that happened in Earth’s history.
B. They are based on the type of fossils found in rock layers of the Earth.
C. They are based on a different type of calendar used to track Earth’s history.
D. They are based on the thickness of the Earth's rock layers.
Answers
GPT-4o mini
The correct answer is: **A. They are based on important events that happened in Earth’s history.**
The geologic time scale is organized around significant events, such as mass extinctions or major geological changes, rather than being divided into even lengths of time. This leads to periods of varying lengths based on the duration of these events and the changes that occurred during those times.
The geologic time scale is organized around significant events, such as mass extinctions or major geological changes, rather than being divided into even lengths of time. This leads to periods of varying lengths based on the duration of these events and the changes that occurred during those times.