'This longest division of geologic time doesn't have a fixed period; in astronomy, it's one billion years'
an eon
YOU PICKED A FINE TIME: This longest division of geologic time doesnt have a fixed period; in astronomy, its one billion years
This longest division of geologic time doesn't have a fixed period; in astronomy, it's one billion years
This longest division of geologic time doesn't have a fixed period; in astronomy, it's one billion years
YOU PICKED A FINE TIME
an eon
YOU PICKED A FINE TIME