Volcanoes Of The Usa
There are some natural forces which play or have played a major role in the shaping of the earths surface. Volcanism is one such phenomenon. It has been involved in the building up of many great mountain ranges, formation of molten rock etc. these are eruptions which are very explosive with a very large size and power. This natural calamity can be very disruptive.
In this essay we will cover volcanoes of the USA, the different kinds of volcanoes of the USA, the single or combination volcanoes of lava and ash, the advantages and the disadvantages of the volcanoes. Factors that determine volcanic eruptions, materials that can be extruded from them and features produced by volcanic activity. We will also cover the active volcanoes, the prediction of volcanoes and advance warning against the same. What is the future concerning them and utilization of raw power provided the volcanoes? Volcano
A volcano can be defined as a crack or hole in the earths crust from which molten lava rises out through a mountain to the earths surface. The surface of the earth is divided into two plates which are in motion on the layers of the soft rocks which lie under these layers. When collision takes place between these plates volcanoes are formed. It mainly consists of lava and rocks. Underneath a volcano, there is molten rock called magma. When the pressure to these molten rocks increases due to the gases, volcanic eruptions occur.
These eruptions can be in the form of lava, poisonous gasses, ashes or flying rocks and landscapes. THEORY OF PLATE TECTONICS This theory explains the location of volcanoes. The surface of the earth consists of large plates in motion that moves from about 1-10cm/year. Where these thick plates collide or part, or even in the middle these plates, formation of volcanoes take place. Volcanoes of the USA The volcanoes of the USA are basically found in Alaska, Hawaii and the western states.
The United States is geographically very diverse and almost all kinds of natural disasters have been seen occurring here. Every year a hurricane, every few years flood and earthquakes and infrequent volcanoes can be seen. It ranks third in the world for the occurrence of active volcanoes after Japan and Indonesia. About 50 volcano eruptions take place in the US and some of them have been very destructive. Between the volcanos eruptions that took place from 1980-90, around 26000 people were killed and 450000 had to leave their homes.
The main evidence of the US volcanoes is found from the rocks both at and below the surface of the earth. For example: Thick ash deposits were found between the sandstones in Nebraska, in the granite of Sierra Nevada Mountain, and layers found in the East Maine (http://pubs. usgs. gov/gip/volcus/page03. html). More than 150 volcanoes have occurred in the US in the past 10000 years out of 1500 volcanic eruptions of the world. They are also found in Aleutian islands, cascade range of the pacific apart from Alaska, Hawaiian islands and the western states.
Most dangerous volcanoes According to John Roach, out of the 169 volcanic eruptions occurred in the united states, the most dangerous and disruptive ones are: Kilauea, Hawaii Mount saint Helens, Washington Mt rainer, Washington Mt Shasta, California South sister, Oregon Lassen volcanic center, California Mt hood Oregon Redoubt volcano. Alaska Crater lake area, Oregon and many more(john roach, 18 most dangerous U. S volcanoes include erupting Alaska peak, report for national geographic news, 2006). Disadvantages
They are very disastrous and have many disadvantages. It causes loss of life, property and environment at large. It causes devastation of huge areas with the blasts, lava burns and buries the surroundings, both living and non-living. The mud flow sweeps over civilizations. It emits loads of poisonous gasses which causes diseases and genetic and lung ailments. The huge ash clouds created by these eruptions blankets acres and miles and has often brought down airplanes and passenger planes due to the same. Advantages
On the other hand, volcanoes have some advantages also: This natural calamity provides us with many natural resources of high value such as: The ash of the volcanic eruptions spread over thousands of acres of land improves the fertility of land exponentially by the addition of nutrients which is beneficial both for forests and agriculture. It is a resource for Geo-thermal energy. The very hot magma heats the ground water bodies which contains many important minerals like tin, gold , copper, silver etc.
this is deposited and mined all over the world. Monitoring of volcanoes and future Out of the 18 most dangerous volcanoes of the USA, only three have been successfully monitored. According to Stanley Williams, “there a few volcanoes that are really being studied at a very close level (Stanley Williams, volcanologist, Arizona state university, Tempe). Scientists today conduct research to monitor the occurrence of these eruptions to reduce the social and economic hazards by volcanoes.
This is done by assessing the activities that happen during, before and after the volcanic eruptions and also provide the necessary information to the public regarding the assumptions of the occurrence of future eruptions, the safety and remedial measures to be taken care of. According to Robert Britt, the only way to forewarn communities at risk in enough time is to activate emergency response plan and NVEWS i. e national volcano early warning system should be created for 24/7 volcano watch. ” (Robert Britt, warning: dangerous U.S volcanoes not properly monitored, 05, ET).
WORK CITED PAGE
1. Britt, Robert, Warning: Dangerous U. S Volcanoes Not Properly Monitored, 29th April 2005, ET, National Geographic news. http://findarticles. com/p/articles/mi_m1511/is_11_20/ai_57042524. html 2. Stanley Williams, volcanologist, Arizona state university, Tempe,18 Most Dangerous U_S_ Volcanoes Include Erupting Alaska Peak. htm. 3. Volcanoes of the United States, http://pubs. usgs. gov/gip/volcus/page03. html. 4. Parr, Mark, Meyer Linda, volcanoes of the US, Volcanoes of The United States. htm.Sample Essay of Eduzaurus.com