Slow Heart Beat (Bradycardia) An abnormally slow sinus heart rate is called the âsick sinus syndromeâ and, if severe, results in symptoms of fatigue. In some such cases a permanent pacemaker is needed to be implanted to generate a normal heart rate. Many people with sick sinus syndrome also develop atrial fibrillation.
Petrified wood (from the Greek root petro meaning rock or stone; literally wood turned into stone) is the name given to a special type of fossilized remains of terrestrial vegetation. It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization.lements such as manganese, iron, and copper in the water/mud during the petrification process give petrified wood a variety of color ranges. Pure quartz crystals are colorless, but when contaminants are added to the process the crystals take on a yellow, red, or other tint.
In order for the petrified wood you see here to become petrified, the wood must first be covered with such agents as volcanic ash, volcanic mud flows, sediments in lakes and swamps or material washed in by violent floods-by any means which would exclude oxygen and thus prevent decay.reasures of the Earth, Ltd is your online retailer for authentic fossils, minerals, petrified wood, stone, bronze, and wood statues, fossil replicas, shells, architectural items and information. Wholesale prices are also available!