The worst thing about living near a volcano is the possibility of it erupting, bringing about many negative consequences, such as earthquakes, lava flows, mud flows, flooding, pyroclastic flows, falling ash, carbon dioxide, sulfur dioxide and other toxic gases. In the past, volcanic eruptions have obliterated entire towns and villages and caused great loss of life.Know More
The effect of a volcano's eruption depends on what type it is. Shield volcanoes, such as those in the Hawaiian island chain, cause flows of slow moving lava. These are usually not dangerous to human lives, but damage infrastructure and agriculture. Stratovolcanoes, which are built up from multiple layers of lava, are volatile, highly dangerous and have caused the greatest loss of human life. Subglacial volcanoes cause eruptions beneath glaciers or sheets of ice, and the meltwater can cause catastrophic flooding.
The U.S. Geological Survey has a color-coded system to warn those living close to volcanoes. Green means that the volcano is in its normal, or non-eruptive stage. Yellow warns of signs of background unrest. Orange means that there is significant unrest with likelihood of eruption, or minor eruption activity has begun. Red signals that a major eruption has already commenced or is about to commence. The USGS also has a Volcano Hazards Program to educate people on the dangers of volcanoes and avoid catastrophic consequences in the future.Learn more about Volcanoes
The temperature of lava ranges from 700 degrees Celsius (1,292 degrees Fahrenheit) to 1,250 degrees Celsius (2,282 degrees Fahrenheit). The higher temperatures are reached in Hawaiian volcanoes.Full Answer >
Lava, or molten rock that erupts from volcanoes and fissures, is so hot because rock only melts at very high heat. Typically, only a small portion of any rock melts, even at depths of around 93 miles inside the Earth.Full Answer >
A volcano is a place where molten rock seeps or erupts from beneath the crust. Most volcanoes develop in the oceans, but some occur on land. When the molten rock, which is called lava, erupts with force, large, cone-shaped mountains form, which are also called volcanoes.Full Answer >
A volcano that has recently erupted and may erupt again soon is categorized as an active volcano. Dormant and extinct are also categories of volcanoes.Full Answer >