Trees lean all the time to reach the light, and reaction wood
helps them stand up despite the fact that they're leaning," Snyder said.
Rings that are large on only one side of the tree indicate reaction wood growth to reinforce the tree's strength against gravity after a hurricane or landslide gave it the old gangster lean.
Reaction wood caused by high winds has been used to establish a record of typhoons hack to 473 CE using Japanese cedar Giant sequoias have recorded fires for the last 3,000 years, Bristlecone and foxtail pines show the frequency of volcanic eruptions big enough to affect climate for the last 5,000 years.
Table 1 is an example taken from the Austrian Wood Trading Regulations (OHHU 2006) guidelines in which the two features crookedness and reaction wood proportion are shown.
According to Table 1, a log without reaction wood and crookedness in two planes in which the orthogonal plane crookedness amounts to 8 percent (OHHU 2006) is sorted into the same quality grade as a log with the same degree of crookedness and a 35-percent reaction wood proportion.
The low grade was selected according to class C of the Austrian timber grading rules, which defines this wood as below-average quality, showing considerable knottiness, high reaction wood
and spiral grain, pitch pockets, and other acceptable defects.
Reaction wood as a proportion of the cross section area of the log;
Knots or reaction wood might play a less important role in grading the lumber produced, because the color difference between sapwood and heartwood seems to disturb the customers more than a knot.
Limbwood contains a great deal of reaction wood whose mechanical properties are much different from normal wood.
The half-section containing reaction wood was discarded.
wood laid down when the stem is within the active crown of the tree) [13,17], and the occurrence of reaction wood
 are highly correlated to wood strength and stiffness.
But it appears to have paid off judging by the reaction Woods
receivedasheenteredthelegendary amphitheatre that represents the spirit of this magnificent 7435-yard golfing utopia.