What comes First? Directions: Arrange the following significant events in geologic time. Put numbers 1-12, 1 as the first event and 12 as the last event. Write your answer on your worksheet.
_____1. Planet Earth formed.
_____2. The Earth's first oceans formed.
_____3. Oxygen began to accumulate in the Earth's atmosphere.
_____4. The first animals with backbones (fish) evolved.
_____5. The dinosaurs went extinct.
_____6. Earth's core and crust formed.
_____7. The first life appeared on Earth.
_____8. The first animals appeared.
_____9. The first land plants appeared.
_____10. The first dinosaurs appeared.
_____11. The first land animals with backbones evolved.
_____12. Modern human appeared​