The Yellowstone crater is really a “vent” of a large piece of thermal material that extends hundreds of kilometers down through the crust. The plume persists for at least 18 million years and is the area where the earth’s mantle lava rises to the surface. The plume remains relatively stable, and the North American continent has passed it. Geologists track a series of caldera created by the plume. These craters extend from east to east and move southwest as the plate moves. Yellowstone Park is located in the middle of the modern crater. The crater experienced a “super volcanic eruption” between 2.1 and 1.3 million years ago and then erupted again about 630,000 years ago. Super volcanic eruptions are huge, spreading ash and rock clouds over thousands of square kilometers of landscape. Compared to those, the small volcanic eruptions and hotspots exhibited at Yellowstone Park today are relatively small. The plume that supplies the Yellowstone crater passes through a magma room about 80 kilometers (47 miles) long and 20 kilometers (12 miles) wide. It is filled with lava and is temporarily resting below the surface of the Earth, although lava movements in the lava occasionally cause earthquakes. The heat from the plume creates a geyser (spraying hot water from the ground into the air), hot springs and mud basins throughout the area. The heat and pressure from the magma chamber are slowly increasing the height of the Yellowstone Plateau, which has been rising rapidly recently. However, so far, there is no indication of an imminent volcanic eruption. Scientists studying the area are more concerned about the danger of hydrothermal explosions between major super volcanic eruptions. These are the explosions caused by the local superheated water system when it is disturbed by earthquakes. Even a very distant earthquake can affect the magma chamber. There are sensational stories every few years, which indicates that Yellowstone is about to explode again. Based on detailed observations of local earthquakes, geologists are convinced that it will erupt again, but may not explode soon. In the past 70,000 years, the area has been quite inactive, and the best guess is to keep thousands of people quiet. But don’t make a mistake, Yellowstone’s super eruption will happen again, and when it happens, it will be a disastrous mess. Inside the park, lava flows from one or more volcanic sites may cover most of the landscape, but the bigger concern is that the ash cloud blows away from the volcanic eruption. The wind blows the ashes to 800 kilometers (497 miles), eventually covering the ash layer in the central United States and destroying the country’s central granary area. Other states will see dust from the ash, depending on how close they are to the volcanic eruption.