Volcanoes cause physical damage to structures and buildings, wildlife, local vegetation and the atmosphere, as well as posing health risks. Residences within the vicinity of a volcanic eruption often receive timely notice before an eruption occurs. This reduces the likelihood of danger to humans.Know More
Scientific advancements in vulcanology have led scientists to be able to discover signs that indicate when a volcano is about to erupt. This allows the scientists to provide adequate notice to civilians before an eruption occurs, minimizing tragedy to humans.
Even when humans evacuate, however, damage to structures and buildings can occur. Volcanic eruptions throw large amounts of ash. When this ash descends and collects on the rooftops of buildings, the likelihood of the roofs collapsing increases. Because this ash is comprised of fine glass particles and is toxic, when it is breathed in, humans and animals in the immediate vicinity often experience respiratory problems.
Lava flowing from the center of the volcano causes a fire danger to wildlife and plants in the area, with the effects often felt for many miles around. Lava and fallen ash also destroy plant life by smothering it. Volcanic eruptions are also sometimes responsible for triggering tsunamis and electrical storms within areas surrounding the eruption.Learn more about Volcanoes
Volcanoes occur when magma from the earth's mantle reaches the surface. This can happen at the place where two tectonic plates diverge or converge. It can also occur in a place called a hotspot, in which magma from the mantle reaches the surface in the middle of a tectonic plate.Full Answer >
Volcanic eruptions can either be effusive or explosive. An effusive volcanic eruption occurs when the lava pours out onto the ground from the volcano's vent. When the molten rock or magma is thin and runny, gases can easily escape and the lava flows freely and travels far. An explosive volcanic eruption is caused by thick and sticky magma, which prevents gases from escaping and causes them to explode violently.Full Answer >
Volcanoes are measured and reviewed through the Volcano Explosivity Index, or VEI, which determines the quality of the volcano, the volume of the lava, how high the volcano measured at the time of eruption and how often the volcano explodes, according to the Old Farmer's Almanac. By reviewing each volcano against this criteria, it is simpler to determine which ones have had the most impact.Full Answer >
Volcanoes are formed when the molten rocks and gases under the earth break through the crust and erupt. A volcano can be a crack, a dome or a mountain with a crater at the top.Full Answer >