What are the Dangers of Living too Close to Volcanoes Erupting volcanoes can generate many primary hazards including lava flows, pyroclastic flows, pyroclastic surges, volcanic bombs, ash clouds, landslides, debris flows, and clouds of poisonous gas. The style of eruption and type of hazard generally depend largely on the size of the eruption, the composition of the erupting magma, and the environment in which the eruption occurs. The size of a volcanic eruption is quantified …showed first 75 words of 2287 total…

…showed last 75 words of 2287 total…the edifices and higher concentration of elements easily leached by percolating groundwater. Thermal springs are often associated with volcanoes. The water in some of these springs is acidic. Hot, acid waters will enhance the breakdown (or leaching) of the rock and will often carry dissolved metals. Because of this, streams and rivers draining volcanic areas may have a significantly different trace-element chemistry than nearby streams draining other regions underlain by more chemically stable rock types.