Myelography is an x-ray examination of the spinal canal. A contrast agent is injected through a needle into the space around the spinal cord to display the spinal cord, spinal canal, and nerve roots on an x ray.he purpose of a myelogram is to evaluate the spinal cord and/or nerve roots for suspected compression. Pressure on these delicate structures causes pain or other symptoms. A myelogram is performed when precise detail about the spinal cord is needed to make a definitive diagnosis.
This is one of the only countries that doesnât touch the Pacific Plate. Instead it lies along the border of the Nazca and South American plates but is still considered to be part of the Ring of Fire. Chile records high levels of rainfall that add to earthquakes and tsunamis as natural disasters to be feared here. Chilean natural disasters include:
The Ring of Fire is one of the most geologically active areas on Earth, and is a site for frequent earthquakes and powerful volcanic eruptions. Many volcanoes on Earth are located around the Pacific Ring of Fire.Image Credit: U.S. Geological Survey. There are more than 450 active and dormant volcanoes located within the Ring of Fire.he Ring of Fire is a long chain of volcanoes and other tectonically active structures surrounding the Pacific Ocean. The Ring of Fire is a long chain of volcanoes and other tectonically active structures that surround the Pacific Ocean.