which unit of geologic time is the oldest?\ncenozoic\nmesozoic\nordovician\nprecambrian
which unit of geologic time is the oldest?\ncenozoic\nmesozoic\nordovician\nprecambrian
Answer
Brief Explanations:
The Precambrian is the earliest and longest - lasting division of geologic time, preceding the Phanerozoic eon which includes the Paleozoic (where Ordovician is a period), Mesozoic, and Cenozoic eras.
Answer:
Pre - cambrian