there are three, but we live in one of them :)
Denis McQuail
The era that is divided into smaller units of time scale is the "Geological Era." Geological eras are major subdivisions of geological time and are further divided into periods, epochs, and ages, allowing scientists to study Earth's history in more detail. The three primary geological eras are the Paleozoic, Mesozoic, and Cenozoic, each encompassing significant events in the planet's evolutionary history.
A period of 2000 years is called a "bi-millennium" or "two millennia." The term "millennium" itself refers to a period of 1000 years, so two millennia would equate to 2000 years. Historically, such time spans are often used to mark significant epochs or eras in history.
There are 66 books of the Bible. Most of the 66 have some history in them. There are only about 2 that don't.
10 different American pennies have been produced in the history of America.
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 geological time scale is the history of the earth. This is in the eras period and epochs.
The geologic time scale is divided into four eras: the Precambrian, Paleozoic, Mesozoic, and Cenozoic eras. Each era represents a distinct span of time in Earth's history with characteristic geological and biological features.
There are three main geological eras in Earth's history: Paleozoic, Mesozoic, and Cenozoic. These eras are further divided into periods and epochs to more accurately represent the stages of Earth's history.
Earth history is primarily divided into eras.
Denis McQuail
because
precambrian era, paleozoic era, mesozoics era, cenozoic era
Earth's history is divided into eras.