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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.
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?
Geologic Time. It's called the Geologic Time Scale.
The shortest piece of Geologic time is the Holocene Epoch in the Cenozoic Era>
No, a geologic era is a longer unit of time than a geologic period. Geologic eras are divided into periods, which are further subdivided into epochs. The hierarchy from largest to smallest is era, period, epoch.
The table you are referring to is likely the Geologic Time Scale. It divides Earth's history into different time periods based on significant events and changes in the planet's geology, climate, and life forms. These time periods are typically grouped into eons, eras, periods, epochs, and ages.
The longest in geological time is an Eon eg. Archeozoic Eon . Edit: there is also the supereon, which is usually composed of 2-3 eons.