Why are time periods on the geologic time scale not even in length?(1 point)
Responses
They are based on the type of fossils found in rock layers of the Earth.
They are based on the type of fossils found in rock layers of the Earth.
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 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.
1 answer
They are based on important events that happened in Earth’s history. Each time period on the geologic time scale represents significant changes or developments in Earth's history, so they can vary in length based on the duration and importance of these events.