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Geologic History and the Evolution of Life (Vocabulary (Eon (Longest unit…
Geologic History and the Evolution of Life
Vocabulary
Eon
Longest unit of geologic time.
Era
A subdivision of eon.
Period
A subdivision of era.
Epoch
Subdivision of period.
Mass extinction
An extinction of many species on earth within a short period of time.
Land bridge
What connects two previously separated continents.
Geographic isolation
The separation of a certain type of species due to some physical barrier.
Essencial questions
How was the geologic timescale developed?
They choose the time boundaries based on what they observe in the rock's layers .
What are some causes of mass extinction?
Super volcano, nuclear winter, meteor
How is evolution affected by environmental change?
To live, animals have to adapt/ evolve to any environmental change and if they don't manage to do that, that species becomes extinct.