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Geologic History and the Evolution of Life (Eon (The longest units of…
Geologic History and the Evolution of Life
Vocab
Eon
The longest units of geological time.
Eras
Eons are subdivided into smaller units of time called eras.
Periods
Eons are subdivided into periods.
Epochs
Periods are subdivided into epochs.
Mass Extinction
The extinction of many species on Earth within a short period of time.
Land Bridge
Connects to continents that were previously separated.
Geographic Isolation
Is the separation of a population of organisms from the rest of its species due to some physical barrier, such as mountain ranges or an ocean.
Questions
How is the Geologic Timeline divided?
The Geological timeline is divided into different units of time. This units of time are called Eons, Eras, Periods, and Epochs.
What are the different types of Environmental Change.
A type of environmental change is climate. This type of environmental change could cause mass extinction if organism don't quickly adapt to the change in their environment. Another type of environmental change is geographical changes. This include land bridges and Geographical Isolation.
What's the Precambrian Time?
The Precambrian Time is a period of time that is composed of many Eons. This time is almost 4 billion years long and is almost 90 percent of earth's lifetime. This period of time was before complex organism formed.