Definitions
scientific study of the origin, history, and structure of Earth and the processes that shape it
Geology
True or False: The divisions within the Geologic Time Scale are all based on the same amount of time
False
which era did not end with a mass extinction (as of now?)
Cenozoic
~ 4.6
How many years has Ms. Gunnings worked at OCS?
15 YEARS
What are two criteria of being a good Index Fossil?
1. Over a large geographic area
2. Lived for a short period of time
How many eons are present within the time scale?
Four
Pangea formed during the __________ era
Paleozoic
How old is Earth?
4.6 BYA
The Atlantic ocean starts to open up during the ________ era
Mesozoic era
divides Earth’s history into intervals of time defined by major events or changes on Earth
(Geologic) Time Scale
How many mass extinction events have there been throughout the history of life?
Five
The Cenozoic era began
65 million years ago
The Precambrian time is combosed of the eons, Hadean, Archean, and ______________
Proterozoic
The __________ lived during the Mesozoic era
dinosaurs
the idea that the same geologic processes that shape the Earth have been at work throughout Earth’s history
Uniformitarianism
How is the Geologic Time Scale divided? (must name all four parts)
Eons, eras, periods, and Enochs
The Mesozoic era began
250 million years ago
When was the first sexually reproducing organisms.
Middle Proterozoic
What is Ms. Gunnings Favorite color
Red
Name all four eons
Hadean, Archean, Proterozoic, and Phanerozoic
The present eon is the ___________ eon
Phanerozoic
In which era did the Cambrian explosion occur?
Paleozoic era
cyanobacteria released oxygen via photosynthesis during the __________ eon
Proterozoic
The present eon
Phanerozoic