Here's why:
* Lahar formation: Lahars form when volcanic ash and debris mix with water from melting glaciers, heavy rainfall, or even lakes. This mixture creates a fast-moving, dense slurry of mud and rock.
* Volcanic association: Lahars are most common during or shortly after a volcanic eruption, especially explosive eruptions that produce large amounts of ash and debris.
* Destructive power: Lahars can be incredibly destructive, traveling at speeds up to 80 km/h (50 mph) and carrying large boulders and debris. They can devastate entire communities and infrastructure.
Examples of famous lahars:
* Mount St. Helens, 1980: A massive lahar caused by the eruption buried the Toutle River valley.
* Nevado del Ruiz, 1985: A lahar triggered by a small eruption destroyed the town of Armero, killing over 23,000 people.
Let me know if you have any more questions!
