100 Points! What are the four main time divisions that are used for the geologic time scale and what determines are they are divided? USE YOUR OWN WORDS
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Geologic time is known to be divided into four long segments which are termed as the eons. It determines the time and probable historic events which occurred in this time.

The four long segments of the eon area: are:

Hadean: The Hadean is the eon which predates the Archean. The Hadean eon started with the beginning of the Earth about 4,6 million years ago.

Archean: During this time period, the Earth cooled down to support the existence of life.

Proterozoic: During this time, more complex life began to form. This eon started about 2500 million years ago.

Phanerozoic : This is the current geologic eon with all the diversified form of life.

The Phanerozoic eon is the eon which can be recognized by the division of eras. The eras of the Phanerozoic eon are: Paleozoic, Mesozoic, and Cenozoic. Eras are further divided into periods.

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