of perennial forbs and mature oaks show similar effects of climate but inconsistent responses to fire in the North American prairie-forest ecotone.
Star-sawing--A new method for producing timber with vertical annual rings
. Hol: Roh- Werkst.
In the present patient, the enterolith showed a multiple-layered structure, resembling annual rings
of a tree (Figure 2).
Observations for annual rings
on scales were conducted by using stereo microscope (Leica MZ75, Germany) and photographs of scales were taken and saved (Leica DFC300 FX).
Tree Rings "It has long been known that there is a correlation between the sunspot cycle and the growth of trees, as measured by the thickness of their annual rings
. Now another association between solar activity and tree rings is suggested in Science by Minze Stuiver of Yale University's Radiocarbon Laboratory....
The dendrochronology is the dating and study of annual rings
The clearest annual rings
were observed in the operculum and suboperculum.
Grain is defined as the average width between annual rings
. Top: open grain.
Moreover, it is known that warm-water bivalves, which usually form annual rings
on their shells during the hottest period of the year in the middle and southern portions of their natural habitat, form annual rings
in the coldest period at the northern boundary of their range, for example, Anadara (Scapharca) broughtoni .
The annual rings
form decorative circular patterns.
The appearance of cross section of wood is related to its surface topography and chemical characteristics (early and late wood parts of annual rings
The science of deducing climate from trees, or "dendroclimatology," involves studying the annual rings
that can be seen in horizontal cross-sections of the trunk.
Endgrain tiles are created by slicing a tree across the grain to reveal the annual rings
Such trees are relatively young and in a rapid-growth phase, so the annual rings
are wide and easy to measure.
They learn from this display that how they can calculate the age of a tree by counting its annual rings
; and also about weather conditions from the gaps between these annual rings