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 is actually stone that looks exactly like wood. Petrified wood is actually stone that looks exactly like wood. The detail in the stones is amazing-it looks just like wood but is much stronger and heavier. You can even see the tree rings.Petrified wood literally means wood turned into stone.The word petrify comes from the Greek word petro or rock - Petrify means to change organic matter into a stony concretion by encrusting or replacing its original substance with a calcareous, siliceous, or other mineral deposits.ou can even see the tree rings. Petrified wood literally means wood turned into stone. The word petrify comes from the Greek word petro or rock - Petrify means to change organic matter into a stony concretion by encrusting or replacing its original substance with a calcareous, siliceous, or other mineral deposits.
Petrified wood has been preserved for millions of years by the process of petrification. This process turns the wood into quartz crystal which is very brittle and shatters. Even though petrified wood is fragile, it is also harder than steel.Petrified wood is known for it's exquisite color and detail. Some pieces of petrified wood have retained the original cellular structure of the wood and the grain can easily be seen.Petrified wood can be found throughout the desert regions.It is easy to find and identify.etrified wood has been preserved for millions of years by the process of petrification. This process turns the wood into quartz crystal which is very brittle and shatters. Even though petrified wood is fragile, it is also harder than steel.