An event ( bondbardment )
that occured about 3.8 to 4.1
billion years ago
geological time scale
The geologic time
scale is a system
of chronological
dating that relates
geological strata
to time.
stratigraphy
Stratigraphy is a branch of geology
concerned with the study of rock layers
and layering.
fossil record
Fossil Record is a
biannual
peer-reviewed
scientific journal
covering
palaeontology.
Relative dating
Relative dating is the science of
determining the relative order of past
events, without necessarily determining
their absolute age.
Absolute dating
Absolute dating is the
process of determining
an age on a specified
chronology in
archaeology and
geology.
layers of the earth
The internal structure of the Earth is
layered in spherical shells: an outer
silicate solid crust, a highly viscous
asthenosphere and mantle, a liquid
outer core that is much less viscous
than the mantle, and a solid inner
core.