+Each [year](/wiki/year), a tree forms a new growth ring, a distinct layer of [wood](/wiki/wood). These concentric circles, visible in a tree's cross-section, chronicle its [age](/wiki/age) and the environmental history of its life, including past [climate](/wiki/climate) conditions.
+## See also
+- [Dendrochronology](/wiki/dendrochronology)
+- [Botany](/wiki/botany)
+- [Growth](/wiki/growth)
... 1 more lines