The point where Utah, Colorado, New Mexico, and Arizona meet is called  Four Corners and is unique among the states. Arizona base map, Courtesy of Maps.com. This elevation map of Arizona illustrates the number of feet or meters the state rises above sea level. The lowest areas of the state are along the Colorado River where a low point of 70 feet above sea level is reached. The highest point in Arizona is in the northern part of the state.
The exact cause of Barrett's esophagus is not known. It may result from damage to the esophagus caused by the chronic reflux of stomach acid. Frequent or chronic reflux of stomach acid into the esophagus is called gastroesophageal reflux disease or GERD. Gastroesophageal Reflux.
Parkinsonâs is caused by the degeneration of brain cells (neurons) in an area of the brain called the substantia nigra. These neurons are responsible for the production of a particular neurotransmitter (chemical messenger in the brain) called dopamine and it is the lack of this neurotransmitter that is responsible for the main Parkinsonâs symptoms.