The largest volcano in the world is Mauna Loa on the island of Hawaii. It rises 5 kilometers from the sea floor to the sea level, then four kilometers above the sea, making Mauna Loa 9 kilometers high. It has last erupted in March and April 1984. The most active volcano is Kilauea in Hawaii. It has been erupting since 1983. There are 1,511 volcanoes in the world for active only, active, dormant, and extinct volcanoes. This doesn’t include the thousands of volcanoes underwater and on different planets. An example of a volcano is, Santa Maria, Guatemala. It last erupted on December 22 with 700-1,300 ash plumes floating above the mouth of the volcano. A famous volcano is Mount St. Helens. Space and planets have volcanoes. There are many volcanoes on the moon and Mars. There is no oldest volcano. What causes a volcano to erupt is when two of the fifteen platelets hit each other. This causes an earthquake. This shakes magma in volcanoes, and it builds up in a volcano’s vent. The heat in a volcano causes magma to start to go through the vent. Once the magma reaches the mouth of the volcano, it erupts and it runs down the mouth of the volcano. We call it lava. When a volcano is dead, rocks melt, magma becomes a fluid like water, and it cannot reach the mouth of the volcano. Volcanoes are formed when magma lets ash deposit on its way up to earth’s ground. It then builds up and makes a volcano vent which forms a young volcano. The highest and most active volcano is “Ojos del Salado, Navados” on the border of Chile and Argentina. It is 6887 meters above sea level.