Dendrochronology is the study of the annual variability of tree ring widths, which can be extended back to 8000 years ago.
(Dendrochronology; is; the study of the annual variability of tree ring widths) (tree ring widths; can be extended; back to; T:8000 years ago) (Dendrochronology; is the study of; the annual variability)
Dendrochronology tree ring widths Dendrochronology
is can be extended is the study of
the study of the annual variability of tree ring widths
back to T:8000 years ago
the annual variability