On the Geologic Time Scale,the time unit representing the largest span of time is the
A)Phanerozoic.
B)Precambrian.
C)Proterozoic.
D)Mega-annum.

Question

Quizplus · Accepted Answer

The largest span of time on the Geologic Time Scale is the Precambrian, which encompasses about 88% of Earth's history. The Precambrian extends from the formation of Earth approximately 4.6 billion years ago to the beginning of the Phanerozoic Eon about 541 million years ago. The other choices, Phanerozoic, Proterozoic, and Mega-annum, represent smaller time units within the Precambrian or more recent periods of Earth's history.

On the Geologic Time Scale,the Time Unit Representing the Largest