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There are a number of causes. The most dangerous hazard from volcanoes are pyroclastic flows, which are hot, dense clouds of ash, rock, an gas that race down the sides of a volcano, burning everything they hit. These flows also carry incredible force capable of leveling even the strongest buildings. Falling ash from a volcano may also be very hot. It can get into the lungs and suffocate people. The weight may cause roofs to collapse. If the ash mixes with water either from rain or melting mountain ice it can form a mudflow called a lahar. A lahar moves like a flash flood but is as dense as concrete and can bury entire towns. Ash clouds from volcanoes may also produce lighting, which can kill people and start fires. Molten rock on the surface, called lava, is extremely hot and can easily start fires. Unlike pyroclastic flows, however, lava flows are usually slow-moving. Gasses from volcanoes are toxic and have killed people. In some cases the slopes of a volcano may give way and produce landslides. If the volcano is near water the landslides may trigger tsunamis.

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