GEOLOGY

Detailed explanation-1: -The great Precambrian expanse of time is divided into the Proterozoic, Archean, and Hadean eons in order of increasing age. The names of the eras in the Phanerozoic eon (the eon of visible life) are the Cenozoic ("recent life"), Mesozoic ("middle life") and Paleozoic ("ancient life").

Detailed explanation-2: -Geologists divide the time between Precambrian and the present into three long units called eras (Paleozoic, Mesozoic, Cenozoic).

Detailed explanation-3: -The Cretaceous is the longest period of the Phanerozoic Eon. Spanning 79 million years, it represents more time than has elapsed since the extinction of the dinosaurs, which occurred at the end of the period.

Detailed explanation-4: -The time between the Precambrian Time and the present is divided into three long units called eras: the Paleozoic Era, Mesozoic Era, and Cenozoic Era.

Detailed explanation-5: -The Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras.