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Considering all geologic time before 543 million years ago as the Precambrian Era, there are four total. The other three are the Paleozoic, Mesozoic, and Cenozoic.
Geological eras can be divided into periods, epochs and ages.
Cenozoic Era,third of the major eras of the Earth's history, beginning about 65.5 million years ago and extending to the present. It was the interval of time during which the continents assumed their modern configuration and geographic positions and during which the Earth's flora and fauna evolved toward those of the present.
The geologic time scale refers to measuring the layers of the earth's crust according to what time in history they refer to. In order, the eras from the Precambrian to the present are as follows: Neoarchean, Paleoarchean, Mesoarchean, Neoarchean, Paleoproterozoic, Mesoproterozoic, Neoproterozoic, Paleozoic, Mesozoic, and Cenozoic.
Eons, Eras,Epochs, and period
There are three schools of thought concerning this: One is that modern history is from 1950 onward. Another is that modern history is from 1899 onward The final one is that modern history doesn't exist as something that is modern cannot exist in the past. Modern history is the considered the time after the "middle ages", beginning around 1500. Modern history is comprised of two eras, early modern through about 1800 and late modern which is followed by contemporary history. Most of this terminology is in reference to European and American history and their relationship with other continents. Modern History is only part of history. Modern history is from 1850 onward in some ways.
Because the eras easily seperate what happened in history and is easier to understand
There were several major eras of one party domination in American History. A couple of the eras was the Great Depression and the 1960s.
epochs or eras
identify the major eras in u. s. history from 1877 to present
The boundaries of history of eras are marked by great worldwide changes in continental coastline
The geological time scale is the history of the earth. This is in the eras period and epochs.
1789 was the start of modern history. :) Personnaly I would go back a lot further, to the Renaisance. All history is a continuum, but certainly there are some eras where things did take off rapidly. 1789 ignores the start of serious science in the West, and the age of western exploration.
there are three, but we live in one of them :)
Answer this ques A historian is examining religion's role in history. Which question might the historian ask if she were organizing her study by period? tion…
Veteran vintage classic and modern
Earth history is primarily divided into eras.