This change in cell size produces the characteristic banding pattern seen in cut wood. Trees ... obvious rings, thanks to the large difference in growth rates between the early and late season.

In the frigid landscapes of northern Norway, an unusual phenomenon etched into the rings of trees and shrubs has ... help differentiate between early- and late-season cold events.

Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth don’t lignify properly, creating ‘blue rings’ that appear when wood samples ...

Blue rings found in the stems of trees and bushes in Norway point to a historic cold period in the late 1800s ... they create ...

Now, scientists have used information etched into tree rings to demonstrate ... seeing these really dark dense fans of the late wood portion of the ring.” Those denser sections reflect back ...

And the key to this discovery lies with tree rings. In 2010, excavators in New York's Lower Manhattan discovered buried deep in the ground the remains of a wooden ... back to the late 1400s ...

Warm weather in late January and early ... trees undergo a hard freeze, the water inside of the trunk (xylem) will expand and cause cracks. Cracks in the trunk are entry points for wood-rotting ...