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The geologic time scale.
Geologic column is an ordered arrangement of rock layers that is based on the relative age of the rocks. Geologic time is the time IN the geologic column.
a geologic time scale has eras, made up of periods, epochs, etc. hope this helps! :D
an era is a very long span of geologic time
Eras are subdivisions of larger units of geologic time called eons.
in the scope of geologic time, how significant is the presence of humans?
I'm going to assume you meant the Geologic Time Scale, not the Periodic Table of the Elements. In that case, the answer is the Hadean Era (which is the first in the Precambrian Eon) Although Archean Era might also be acceptable.
Geologic Time. It's called the Geologic Time Scale.
The shortest piece of Geologic time is the Holocene Epoch in the Cenozoic Era>
88 percent of geologic time is represented by the Precambrian time span.