A volcano is a mountain topped with vents, holes, and craters. When the volcano erupts, lava, ash, cinders, dust, and hot gas can pour out the top. Magma (when it's deep in the ground) or lava (when it reaches the earth's surface) is very hot, liquid rock. When the lava cools down, it turns into hard rock. Ash is a gray powder that results from material being burned in the volcano.
Ash can be carried in the air for many miles.
Indonesia has more active volcanoes than any other country. Mount Merapi is one of at least 129 active volcanoes in Indonesia, part of the Pacific Ring of Fire - a section of fault lines stretching from the Western Hemisphere through Japan and South East Asia. Mount Merapi means "Mountain of Fire". Merapi has erupted more than 80 times. The International Association of Volcanology and Chemistry of the Earth's Interior has named Merapi as a Decade Volcano since 1995 because of its high volcanic activity.
Now, Mount Merapi shows again its `ferocious anger`. it's in the highest level after hundreds of volcanic earthquakes. It has erupted at least five times since October 26 2010, sending out hot clouds and other volcanic materials which burnt everything on their paths on the mountain`s slopesSource: http://www.englishcafe.com/blog/merapi-today-103292
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