Geogogic Time Scale

2. This supercontinent formed during the Paleozoic era.
4. ___ is the principle that all geologic change occurs due to sudden, drastic events.
5. Volcanoes added ___ ___ to the atmosphere during the Mesozoic era.
6. This was a likely main cause of the extinction of dinosaurs during the Mesozoic era.
9. Oceans were formed in during the Archean era, thanks to water vapor being added to the atmosphere due to ___ activity.
10. The larges ___ ranges currently on Earth were formed by the final breakup of Pangea and the resulting tectonic collisions.
11. ___ finally came into existence during the end of the Cenozoic era.
12. The abbreviation for Earth's timeline that divides Earth's history by major events and changes is ___.
15. The Earth was formed about 4.6 ___ years ago.
16. At the end of the Proterozoic Eon, much of Earth's land was located near the poles, and therefore __ and lifeless.
17. Much of the earth was frozen during the ___ ___ of the Cenozoic Era.
18. At the end of the Paleozoic era, a massive extinction event called the ___ ___ occurred, where 90% of marine life and 70% of land species disappeared.

1. The __ era was dominated by the breakup of Pangea.
2. The Hadean, Archean, and Proterozoic Eons were all part of this time.
3. The climate during the Mesozoic Era was likely ___.
4. We are currently living in the ___ era.
7. During the Hadean Eon, Earth's molten rock cooled and the planet became ___.
8. ___ is the principle that geologic processes have acted on Earth the same way throughout Earth's history.
13. The Cambrain ___ was a boom of life and diversity at the beginning of the Paleozoic era.
14. ___ is the scientific study of the origins, history, and processes that shape and structure Earth's landforms.