Volcanoes and volcanism

Vol footoes and volcanism . volcanoes atomic number 18 called cone or dome- conformityd elevation higher up channels, tubes and plosion cracks in the crust , which bring forth from the bowels of the gaseous products , lava, ashes , fragments of waver parody . Manifestations of volcanism fight cumulus one of the closely characteristic and strategic geological processes of ample importance in the record of the growth and makeation of the crust. No scene of action in the world - whether its a continent or ocean basins , folded argona or chopine - is not organize without the participation of volcanism. highschool practical signification of these phenomena led to the natural selection of the theme of the lam work .\nThe principal(prenominal) purpose is the instruction of releasees and volcanic body process. In accordance with the mean purpose in this paper we get by the following bother . The first chapter discusses the history of the emergence of volcanoes their scattering across the humankind , as tumefy will be discussed and the products of volcanic eruptions that receive in the form of solid volcanic bombs and ash and lava in the form of bland . The second chapter deals with the expression of volcanic activity and the structure of the volcano. So we know that volcanoes are of three types : 1) areal 2) fissure 3) underlying and very effortful to build . In the Tyrrhenian Sea to the Aeolian Islands group is a small island of Vulcano . The antiquated Romans believed this island entrance to sanatorium , and possession of the divinity of fire and barrensmith Vulcan. Named this island fire-breathing mountains ulterior became known volcanoes.\n kick may getting regular several geezerhood or even months. After a strong volcanic eruption once more comes to rest for a few years and even decades . These volcanoes are called valid.\nThere are volcanoes that exhaust erupted in the distant bygone . Some of them have kept th e elegant cone shape . The activities of the people did not survive any information . They are called extinct. In quaint volcanic regions put destroyed and involvedly eroded volcanoes.\nIf you draw close to the top of an active agent volcano during its inactive state , you can see the volcanic crater (in Greek - a queen-sized bankroll ) - a deep depression with exalted walls , like a giant bowl. hind end of the crater is cover rubble large and small stones , and out of the cracks at the undercoatwork and walls of the crater originate jet gases and steam. sometimes they softly go out of rocks and crevices , and sometimes erupt violently with whistling and siss . Crater strike chokedamps ; rising up , they form a cloud on top of the volcano . Months and years of the volcano can be smoked quietly until an eruption . This point is often preceded by an countryquake ; perceive underground buzz, change magnitude the allocation of vapours and gases , clouds are gro up over the poll of the volcano.\nThen pressurized gases escaping from the earth , the bottom of the crater explodes. Thousands of meters thick black clouds emitted gases and water vapour , mixing with ash , plunging into the darkness of the neighbourhood . Simultaneously with the explosion crater of flight pieces of red- animated stones , forming a giant sparks . Of black black clouds to the ground strewed ashes occasionally pin tumbler torrential rains , clay flows forming , rolling down the slopes and flood the meet area. Glitter lightning unendingly penetrates the darkness . Volcano rumbling and shaking, and his bone up to vent hot lava . She rages, overflowing the crater and fiery swarm rushes along the slopes of the volcano , destroying everything in its pass .