EARTH SCIENCE
FOSSILS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Eon
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Era
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Period
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Epoch
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Geologic Time Scale
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Detailed explanation-1: -The eon is the broadest category of geological time. Earth’s history is characterized by four eons; in order from oldest to youngest, these are the Hadeon, Archean, Proterozoic, and Phanerozoic.
Detailed explanation-2: -The geologic time scale divides up the history of the earth based on life-forms that have existed during specific times since the creation of the planet. These divisions are called geochronologic units (geo: rock, chronology: time).
Detailed explanation-3: -The eras are the four major divisions of the geological time scale: Precambrian, Paleozoic, Mesozoic, and Cenozoic.
Detailed explanation-4: -The four main ERAS are, from oldest to youngest: PreCambrian, Palaeozoic, Mesozoic and Cenozoic. Periods are a finer subdivision in the geological time scale.