Volcanoes are the geological formations on the surface of the earth's crust or the crust of another planet, where magma reaches the surface, forming lava, volcanic gases, rocks (volcanic bombs) and flows. Eruption of the volcano is the release of all these components on the surface. Volcanoes are divided according to the degree of volcanic activity to active, dormant and extinct. Active volcano is considered to be a volcano erupted in historic time. Sleepers are inactive volcanoes, which may be a volcanic eruption, and dull - in which they are unlikely. Volcanology and geomorphology conduct survey volcanoes. The period of activity of the volcano can last from several months to several million years. Eruption of many volcanoes has been tens of thousands of years ago, but now they are not considered valid. Astrophysics, in historical perspective, considers that volcanic activity is caused, in turn, tidal influence of other celestial bodies, may contribute to the emergence of life. Volcanoes have contributed to the formation of Earth's atmosphere and hydrosphere, throwing a significant amount of carbon dioxide and water vapor. Volcanic eruption is the process of release of a volcano on the Earth's surface hot fragments, ash, magma effusion, which becomes lava. Volcanic eruption may have a time period ranging from hours to years. Volcanic eruptions are geological situations that can lead to disaster. Types of volcanic eruptions, as a rule, are named after famous volcanoes where characteristic behavior is observed. Eruption of some volcanoes can have only one type for a certain period of activity, while others may display an entire sequence of types of eruptions. There are different classifications, among which are common to all types of eruptions. Many surveys carried out by the eruption of volcanoes. Eruptions of ash flows were common in the geologic past, but modern man does not observe this. Eruption should resemble clouds or scorching hot avalanches. The magmatic melt enters on the surface, which is boiling up, torn and red-hot fragments of volcanic glass, minerals, surrounded by hot gas shell moving at great speed down the slope. The volume of ash flows can reach tens and hundreds of square kilometers, indicating that the rapid emptying of the pockets of molten acid composition. The scale of volcanic eruptions is an indicator of volcanic force, which is based on the volume of ejected products and height of the column of ash. A lot of sophisticated equipment continually monitors the movement of landmasses. It is studying gas emissions and their composition and predicts the possibility of the eruption.
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