The term volcano refers to the opening or vent through which the molten rock and associated gases are expelled. Volcanoes are mountains, but they are very different from other mountains; they are not formed by folding and crumpling or by uplift and erosion. Instead, volcanoes are built by the accumulation of their own eruptive products. A volcano can also be defined as a liquid rock plumbing system which extends from several 10's of kilometers depth to the earth's surface, and includes the near vent deposits of eruptions. Geologists have generally grouped volcanoes into four main kinds: cinder cones, composite volcanoes, shield volcanoes, and lava domes.
Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt(explode). Extremely high temperature and pressure cause the rock to melt and become liquid rock or magma. When a large body of magma has formed, it rises through the denser rock layers toward Earth's surface. Magma that has reached the surface is called lava. Lava, ash, and debris flows are the most common and serious volcanic hazards, but others do exist.
Obviously, there is no way to stop an eruption. It is possible, however, to attempt to reduce the eruption's effects by reinforcing structures. For example, strengthening roofs to support the weight of tephra - the material blown out of the volcanic vent when an explosion occurs- deposits or by building protective works (such as walls to deflect lava flows away from developed areas). Such efforts can be and have been successful, but are of limited use in a large-scale eruption.
There are more than 500 active volcanoes (those that have erupted at least once within recorded history) in the world, not counting those that lie beneath the sea. Fifty of them are in the United States (Hawaii, Alaska, Washington, Oregon, and California).
These are words that most people associate with volcanoes. But some good effects can come out of volcanoes. ... Out of the 550 of the world's active volcanoes, the world's largest active volcano is Mauna Loa, it is one of the Hawaiian islands. ... Then there are underwater volcanoes and above ground volcanoes. ... This is the only volcano found on the planet mars. ...
These are words that most people associate with volcanoes. But some good effects can come out of volcanoes. ... Out of the 550 of the world's active volcanoes, the world's largest active volcano is Mauna Loa, it is one of the Hawaiian islands. ... Then there are underwater volcanoes and above ground volcanoes. ... This is the only volcano found on the planet mars. ...
How are volcanoes formed? Are there different types of volcanoes? ... Volcanoes are formed in different ways. ... These consist of the shield volcanoes, strato (composite) volcanoes, and caldera complex volcanoes. ... It is classified as a complex volcano, so it is an explosive and very steep strato volcano. ...
This report features what are volcanoes, how are they formed and where are they located. It also has a recent occurrence of a volcano eruption and how did the community react to it. Volcanoes are mountains formed out of lava and ashes through an opening in the earths crust. ... After many eruptions volcanoes expand. There are two ways that volcanoes are formed. ...
Some of the most famous composite volcanoes include Mount St. ... At 6,893 meters in elevation, not only is it the highest active volcano in the world, but Ojos del Salado is the highest active volcano in Chile and the second highest active volcano in the Southern and Western Hemispheres. ... The Mayon Volcano is 2,462 meters in elevation and is a symmetrical composite volcano. ... Another harsh eruption from the Mayon Volcano was in 1993. ... Interesting facts such as how high a volcano's elevation is or how many deaths it caused makes a volcano well-known to the public eye. ...
A volcano can erupt many times in its lifetime. ... There are three major types of volcanoes, cinder cone volcanoes, composite volcanoes, and shield volcanoes. ... The second major type of volcano, the composite volcano, in contrast to the cinder cone can grow much larger. One famous example of a composite volcano is Mt. ... The third type of volcano is the shield volcano. ...
Volcanoes A volcano is a vent in the earth's crust through which magma (molten rock) and gas are released. ... Types of Volcanoes There are three different types of volcanoes that can be formed around a vent. ... Since these volcanoes consist of loose materials they do not grow as large as other volcanoes. ... The third type of volcano is the composite volcano. ... I then molded a volcano shape out of the clay. ...
This cone is what we know as a volcano. There are several ways in which a volcano can form, just as there are several different kinds of volcanoes. Among the different kinds of volcanoes are shield volcanoes, cinder cones, and composite volcanoes. The most majestic of the volcanoes are composite volcanoes, also known as strato-volcanoes. ... There are two types of shield volcanoes, Hawaiian volcanoes and Icelandic. ...
Some volcanoes are more active than others. ... Fuji are all examples of strata volcanos. Shield volcanoes are made of thousands of thin lava flows. ... Shield volcanoes are the largest volcanoes. ... After this, hot springs may form from the volcano. eventually volcanic heat will disappear, and cool water will issue from the volcano and the ground in it's vicinity. ...
