As the subducted Juan de Fuca plate is subjected to increasing pressure it becomes hotter and begins to melt. The molten rock, called magma begins to rise towards the surface. When it reaches the surface it erupts and a volcano is formed. Mt St Helens is incidentally an active composite volcano as it is found on a destructive plate margin. Like the other volcanoes found in the Cascade Range, Mt St Helens (MSH) had been dormant for many years.
Fun Facts * Volcanoes are openings in the Earth’s surface. When they are active they can let ash, gas and hot magma escape in sometimes violent and amazing eruptions. * The word volcano originally comes from the name of the Roman god of fire, Vulcan. * Volcanoes are usually located where tectonic plates meet. This is especially true for the Ring of Fire, an area around the Pacific Ocean where over 75% of the volcanoes on Earth are found.
Inadequate design for heat removal. Inadequate control systems and safety systems. Inadequate operational procedures, including training. A runaway exothermic reaction can have a range of results from the boiling over of the reaction mass, to large increases in temperature and pressure that lead to an explosion. Such violence can cause blast and missile damage.
A volcano is a vent in the crust of the Earth from which molten or hot rock and has explosively violent potential. Volcanoes are important to us because they create new land. The land around a volcano is very fertile and has important and valuable minerals in the soil. Also, their geothermal power can be converted into an alternative energy source. This paper will be about Mount St. Helens.
It's on a destructive margin (a margin where land/crust is destroyed by it being pushed down under another plate, where the plates are moving together). Over time, the volcanic activity at this margin has made Japan, in the same way that Hawaii was formed. Unfortunately, because the earth still shifts a lot, Japan is constantly threatened by severe earthquakes. Earthquakes in the past have killed hundreds of thousands of people. Japan is in the same situation as California, which is right along the San Andreas fault.
b) Discuss the scientific evidence for your theory. When studying the rocks in Italy Walter and Luis Alvarez found very high concentrations of iridium in the rocks and these levels were close to the levels of the last dinosaur remains. The two natural sources of iridium are asteroids and lava from the Earth’s core. This led them to suggest that an asteroid collided with the Earth causing dinosaur extinction. More evidence to support this theory is that the layers of the rocks: the upper layer which contained soot which they believed came from global fires caused by the impact of the asteroid and the lower layer which contained quartz crystals and tektites which are found on asteroid impact sights.
Mount Rainier, Magnificent and Mysterious ENG121: English Composition I Mount Rainier, Magnificent and Mysterious Mount Vesuvius destroyed Pompeii in a matter of hours. Millions of tons of rock and ash fell on the city. When things finally calmed down, Pompeii is buried under one to two feet of rock and the city is all but wiped from the face of the Earth (Tarshis, 2013). What would it have been like to live near Mount Vesuvius before it erupted? I believe it would have been magnificent.
J. Subbiondo © 2004The CrustThe outer layer of the Earth is called the crust. It is made up of rock that floated to the surface when the Earth was formed. It is not a continuous layer, but is made up of large masses called tectonic plates.These plates drift slowly across the Earth's surface (tectonic means moving).The movement of these plates creates mountains and valleys.At weak points in the crust, it causes volcanic eruptions. And when plates bump into each other, earthquakes occur -- emitting shock waves or vibrations called seismic waves. The crust is the Earth's coldest layer.
The volcanoes can be dangerous as well. Mt. Etna in Sicily, Italy is considered one of the most active volcanoes on earth. While Japan has over 100 active volcanoes, some that are very dangerous. These volcanoes are caused by tectonic plates that make up part of the earths surface.
Earthquakes are tremors in the earth’s crust which are caused mainly by tension between the tectonic plates. The most destructive earthquakes are often at destructive plate boundaries, where the more dense oceanic plate is being subducted under the less dense continental plate. These plates will build up pressure over time before slipping releasing huge amounts of kinetic energy. However earthquakes are apparent along other plate boundaries. Conservative plate boundaries, such as the Pacific and North American plate, move at 2-3cm/year causing damage to cities along the fault, such as Los Angeles.