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.
Petrified logs. A 27 mile road runs through Petrified Forest National Park, from exit 311 of I-40, south to US 180. The surroundings are for the most part empty grasslands, and the closest town is Holbrook, 26 miles to the west.The visitor center is at the north end and there is a small museum at the south entrance.etrified logs. A 27 mile road runs through Petrified Forest National Park, from exit 311 of I-40, south to US 180. The surroundings are for the most part empty grasslands, and the closest town is Holbrook, 26 miles to the west. The visitor center is at the north end and there is a small museum at the south entrance.