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.
The petrified forest are paleontology sites where there are fossilized trees from past geological eras. Patagonia is one of the richest areas in the world on this kind of sites, with the Petrified Forest Natural Monument, in the Santa Cruz province and the Sarmiento Petrified Forest in Chubut, as main exponents.The origin of these petrified forest comes from the Late Jurassic period, approximately 150 million years ago.atagonia is one of the richest areas in the world on this kind of sites, with the Petrified Forest Natural Monument, in the Santa Cruz province and the Sarmiento Petrified Forest in Chubut, as main exponents. The origin of these petrified forest comes from the Late Jurassic period, approximately 150 million years ago.