The difference between them is the Pure Sine Wave inverter produces a better and cleaner current. They are also considerably more expensive. You might find it practical to get a small Pure Sine Wave inverter for any special need you may have, and also a larger Modified Sine Wave inverter for the rest of your applications.
Elm Trees can live over 100 years in their natural environment.
STEP 4. Divide the radius (r) by the average width (w) of one annual growth ring toget the approximate age of the tree.r/w = approximate age24 inches/.2 inches per year = 120 years!An age of 120 is relatively young for a white oak. Under perfect conditions, a white oaktree can live to be 300 or more years old.