What is the volcanic eruption ? Why do volcanoes erupt?

Volcanoes, is one of the most important natural terrain on the surface of the globe which is located on land as they are located in the sea alike. Constitute volcanoes major threat to living organisms because of caused by the disasters of unforeseeable her end for them, where they are when they explode graduated from lava that is high degrees of temperature, leading to the burning of anything pass it, in addition to out vapors and other materials melted them, all very dangerous substances on living organisms of all, they come out of the depths of the earth through volcanic craters on the surface, and specifically on the volcanic mountain summit. Volcanoes have caused massive human disasters and destruction in several regions and points of the globe areas.

 Home volcano parts are volcanic cone and crater and volcanic Alloafez invasive chimney, Valmkhrot volcanism is that part which is a slope on the sides of the volcano, consisting of lava, a lava that came out of the volcano and refrigerate at its aspects, going out liquid and then become a solid later. The nozzle shall be in the form of volcanic cone or funnel, which are formed when lava rebound leading to breakdowns in the Earth's surface, with a length in the maximum length of about 2 km approx. While the channel is smoked hyphen between molten tank from the ground to the surface of the earth in. Finally constitute Allowafez cloud formed by the vapors and gases rising from the volcano.

Volcanoes and volcanic eruptions caused by the rush of hot rock from the ground and the combine and spilled outside, where he called the rock melted magma eruptions when they are inside the volcano, but when it is flowing out is called lava that cooled and hardened volcanic rock problem, divided volcanic eruptions into three main types, a Hawaiian and Alstrmboli and Alblaney, and these vary according to different quality Alonoah magma and strength.

 Volcanoes geographically contribute to re-surface formation arise where new rock layers as a result of hardened lava surging from volcanoes problem of new terrain. In addition, they contribute to the emergence of new hot springs, or what is known as hot baths, and the volcanic ash helps to enrich the soil ground, as You can take advantage of the volcanic rocks in the construction, and finally graduated some high economic value of the minerals, which is part of many countries, a source of income.

In spite of the seriousness of the volcanoes, but that this could not be an impediment to the human who dwelt on the slopes and established homes and villages, despite the extreme danger that threatened at any moment by the explosion of the volcano.