Responses
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.
They are based on the type of fossils found in rock layers of the Earth.
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
The correct response is:
They are based on important events that happened in Earth’s history.
The divisions in the geologic time scale are determined by significant geological and biological events, such as mass extinctions and major shifts in the Earth's climate, rather than uniform lengths of time.
