Everyone knows that Merapi Volcano is one of the most active volcanoes in the world. Vulcanologist from Indonesia and foreign agree with that statement. It’s a fact that Merapi often erupt just a few years. Merapi located in the border of Yogyakarta and Central Java. Since 1500 Merapi has erupted till seventieth time. Small eruptions occurs in two until three years. And big erruptions occurs in ten until fifteen years. It’s proof that Merapi is the very active Volcano. Merapi’s eruptions eject some materials. Such as lava, cold materials (rock and sand) and hot clouds. By local people, hot clouds named Wedus Gembel. Hot clouds able to become very dangerous. Because the temperature of hot clouds be able to reach 10000 C. It can kills people that just around. Commonly hot clouds are followed by volcanic ash rain.
