The mass-abundance of the nine most abundant elements in the Earth's crust (see main article above) is approximately: oxygen 46%, silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61%.he mass-abundance of the nine most abundant elements in the Earth's crust (see main article above) is approximately: oxygen 46%, silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61%.
Choosing Disc Weight. Disc golf discs come in a variety of different weights. Most discs weigh between 165 and 175 grams. Some discs also come in special plastic blends designed to weigh less. The Professional Disc Golf Association regulates how heavy a disc can be based on the discs diameter.
From Frisbees to Disc Golf. âSteadyâ Ed Headrick #001 is considered the Father of Disc Golf. Of his dozens of patented inventions, two of them hold infinite importance to our sport. The first was the Frisbee (U.S. Patent #3359678) in 1966 as an employee at Wham-O. The second was the basis of all disc golf targets today, the Disc Golf Pole Hole (U.S. Patent #4039189) in 1975. The concept of disc golf itself however has a long and blurry history.