How is geologic time organized on the geologic time scale?
AMillennia and then smaller periods based on geologic and biologic events that occurred.
BEras and then smaller millennia based on geologic and biologic events that occurred.
CPeriods and then smaller eras based on geologic and biologic events that occurred.
DEras and then smaller periods based on geologic and biologic events that occurred.
AMillennia and then smaller periods based on geologic and biologic events that occurred.
BEras and then smaller millennia based on geologic and biologic events that occurred.
CPeriods and then smaller eras based on geologic and biologic events that occurred.
DEras and then smaller periods based on geologic and biologic events that occurred.