Assessing the age of a living tree is straightforward enough—just extract a core from the tree's circular trunk and count the number of lines in the core formed by the tree's annual growth rings.

Trees add a new layer of wood between the bark and the trunk each growing ... events," said the same source. "The pattern of large and small rings that commonly occur in a sequence of tree rings ...

Though he was never able to tie sunspot activity to ring patterns—his ... throughout the year. As trees grow, the thin layer of living tissue just beneath their bark (the cambium) lays down ...

"The patterns in tree rings tell a story," explains Erin McMurry ... "A fire comes along and heat goes through the bark, killing the living tissue. A couple of years later, the bark falls off ...

Peel away the hard, rough bark and there is a living document, history recorded in rings of wood cells. Each tree ring pattern of growth is unique, as the width of a ring depends on how much water ...

Each year, between spring and fall, cells divide under a tree's bark and a growth ring emerges ... become materialize in narrow growth rings. This pattern is repeated not just in one, but in ...

“The Amazon’s hydrological cycle is becoming more extreme,” co-author Roel Brienen of the University of Leeds said in a ...

Now a new method allows them to study the rings without killing the tree. The impact of an avalanche is clear on the outside of the tree. It breaks off branches and scrapes bark. But it also ...

The basis of dendrochronology lies in a tree's unique pattern of growth rings ... just beneath the bark. The thickness of this ring depends on how much the tree grows during the year: favorable ...