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Created with Fabric.js 1.4.5 Volcanoes How do volcanoes form ? Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger. How do volcanoes affect people and the environment ? Fast-moving lava can kill people and falling ash can make it hard for them to breathe.They can also die from famine, fires and earthquakes which can be related to volcanoes.People can lose their possessions as volcanoes can destroy houses, roads and fields. 20 facts about volcanoes 1.The danger area around a volcano covers about a 20-mile radius. 2.Fresh volcanic ash, made of pulverized rock, can be harsh, acidic, gritty, glassy and smelly.The ash can cause damage to the lungs of older people, babies and people with respiratory problems. 3.Volcanic lightning occurs mostly within the cloud of ash during an eruption, and is created by the friction of the ash rushing to the surface.Roughly 200 accounts of this lightning have been witnessed live. 4. An erupting volcano can trigger tsunamis, flash floods, earthquakes, mud flows and rockfalls. 5.More than 80% of the earth's surface is volcanic in origin. The sea floor and some mountains were formed by countless volcanic eruptions.Gaseous emissions from volcano formed the earth's atmosphere. 6.There are more than 500 active volcanoes in the world.More than half of these volcanoes are part of the "Ring of Fire," a region that encircles the Pacific Ocean. 7. Active volcanoes in the U.S. are found mainly in Hawaii, Alaska, California, Oregon and Washington but the greatest chance of eruptions near areas where many people live is in Hawaii and Alaska. 8.The sound of an eruption volcano can be quiet and hissing or explosive and booming.The loud cracks travel hundreds of miles and do the most damage, including hearing loss and broken glass. 9.The most deadly eruptions have occurred in Indonesia, with tens of thousands of lives lost to starvation tsunami (as a result of the eruption), ash flows, and mud flows.
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