in the scope of geologic time, how significant is the presence of humans?
In the order of time.
Measured rates of erosion.
No such thing. Some geometers consider time to be the fourth dimension. There is a "geologic time scale" which is the time scale at which you notice continents moving and mountain ridges growing and being eroded (very long time scale)
eras and periods
nothing but to make the world more complicated
Cenozoic
Humans
The geologic time scale.
Geologic Time. It's called the Geologic Time Scale.
Cenozoic is not a major period of the geologic time scale. The scale is broken down into eras. Cenozoic, Mesozoic and Paleozoic are all part of the Phanerozic era.
Phanerozoic is the eon which geologic time scale means visable life.
The Precambrian
On a geologic time scale, yes. On any other time scale, no.
Eon The largest expanse of time on the geologic time scale is the eon. An eon would encompass at least two eras.
Eon The largest expanse of time on the geologic time scale is the eon. An eon would encompass at least two eras.
4.6
Eon is the broadest division on the geologic time scale, representing the longest time span. Eons are further divided into eras, which are then subdivided into periods, epochs, and ages.