Volcanoes are mountains that form when hot molten rock (magma) and ash escape from an opening in the Earth’s surface. The molten rock and ash become solid as they cool and this makes a volcano.
Volcanoes are found all over the world. They are made up of different types of rocks, including basalt, andesite, dacite, and rhyolite.
Indonesia is located on the Pacific Ring of Fire, a horseshoe-shaped area where a large number of earthquakes and volcanoes occur. The Ring …