Natural Disaster Volcanoes free essay sample

As it is forced up to the surface, the gases and magma push the earth up with it forming the mountain shape. When the magma gets near the surface of the earth it sometimes erupts violently, but can also erupt without violence. | | A volcano is actually an opening or a fissure, in the Earths crust, through which lava or molten rocks, ash and toxic gases present below the surface of Earth are discharged by a sudden, violent eruption. Sometimes, it can be a mountain-like structure with a bowl-shaped depression at the top, through which these substances are expelled. The term volcano is derived from the name of the Roman God of fire, Vulcan. Volcanic structures are usually formed at places where the tectonic plates are either converging or diverging. A stretching or thinning of the Earths crust, can also lead to the formation of volcanoes. They are often classified into three types, on the basis of their frequency of eruptions, i. We will write a custom essay sample on Natural Disaster Volcanoes or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page e. ctive, dormant and extinct. The active volcanoes are characterized by regular eruptions, while the dormant volcanoes are those that erupted in the past, but are silent now. On the other hand, an extinct volcano is the one that erupted in the remote past and is unlikely to erupt again. Volcanoes are not always erupting. Sometimes they lie quietly for thousands of years in between eruptions. Some volcanoes have areas around them that experience earthquakes and release gases, but do not erupt with magma. | Â  |