Volcanoes evoke more interest in humans than anything else in nature. Volcanoes have been the cause of superstitious worships for several groups of people throughout history. Volcanoes have both the power to create as well as to destroy. According to Gordon MacDonald, in his book Volcanoes, defined a volcano as, "a place or opening which molten rock or gas, and generally both, issue from the earth's interior onto its surface, and the hill or mountain built up around the opening by accumulation of the rock materials" (22). Volcanoes are not scattered erratically about the earth but occur in clusters usually just a few hundred miles from the ocean. There are so many volcanoes along land that borders the Pacific Ocean that the area is labeled the "Ring of Fire." The "Ring of Fire" is an arc stretching from New Zealand, along the eastern edge of Asia, north across the Aleutian Islands of Alaska, and south along the coast of North and South America. .
Magma, rising from lower reaches, gathers in a reservoir, in a weak portion of the overlying rock called the magma chamber. Eventually, but not always, the magma erupts onto the surface. Strong earthquakes accompany rising magma, and the volcanic cone may swell in appearance, just before an eruption. Scientists often monitor the changing shape of a volcano, especially prior to an eruption. The different reasons why a volcano forms are via plumes or hot spots in the lithosphere or as a result of subduction of the nearby lithosphere.
Volcanoes form when hot material from below rises and leaks into the crust. This hot material, called magma, comes either from a melt of subducted crustal material, and which is light and buoyant after melting, or it may come from deeper in the interior of the earth and is light and buoyant because it is very hot. .
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Hot magma, rising from lower reaches of the Earth, eventually, but not always, erupts onto the surface in the form of lava.
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. ...
The term volcano refers to the opening or vent through which the molten rock and associated gases are expelled. ... Instead, volcanoes are built by the accumulation of their own eruptive products. ... Geologists have generally grouped volcanoes into four main kinds: cinder cones, composite volcanoes, shield volcanoes, and lava domes. ... When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt(explode). ... With many volcanoes erupting only every few hundred or thousand years, it's not possible to monitor every site. ...
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. ...
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. ...
