Five periods of chemistry
Periods of reign.
The three periods of Roman history were the monarchy, the republic and the principate. They were divided this way by the types of government in those periods.
Geological eras can be divided into periods, epochs and ages.
Geological eras can be divided into periods, epochs and ages.
Eras divide into periods and periods divide into epochs. The Palaeozoic Era is composed of the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods (in that order). The Mesozoic Era is divided into the Triassic, Jurassic and Cretaceous periods. The Cenozoic Era is divided into the Tertiary and Quaternary periods. The Tertiary period is divided into the Palaeocene, Eocene, Oligocene, Miocene and Pliocene epochs while the Quaternary period is divided into the Pleistocene and Holocene epochs. Note that eras are not the longest lengths of time. Eras may compose longer stretches of time known as eons/aeons.
how was the chin dynasty divided
The Chin dynasty was not divided into two periods. This dynasty was very short lived but it did give China her name and the importance of empire.
The Mesozoic era is divided into Triassic, Jurassic and Cretaceous time periods.
Geologists divide Earth's history into supereons (there's only one, the precambrian), supereons are divided into eons (there are four), eons are divided into eras, eras are divided into periods (Periods may be the most common divisions you read about. The Jurassic is a period), periods are divided into epochs, epochs are divided into ages.After the first era (the Cryptic) The various divisions are mostly determined buy the emergence of some form of life.
BC and AD.
If I’m not wrong it’s Epochs and periods