Volcanoes on a destructive plate margin often lie dormant for years but have explosive and violent eruptions with acidic lava‚ pyroclastic flows and copious amounts of ash. Because of the length of time that they lie dormant prediction isn’t as easy. Montserrat in the Caribbean experienced a violent eruption in the mid 1990’s. The early activity showed signs of a major eruption
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Washington. Which is 50 miles northeast of Portland‚ Oregon‚ and the Cascade Range of the Pacific Northwest. This volcano is a composite volcano. The volcano Mount St. Helens is also known as a strato volcano. It is constructed by alternating layers of lava‚ ash‚ and other volcanic debris. They also tend to erupt explosively and pose considerable danger to nearby life and property. In the year 1980 there was an eruption. Before the time of the eruption there was 5.1 magnitude earthquake. Which probably
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moor‚ among others. Sill: A tabular sheet intrusion where magma has intruded between older layers of sedimentary rock‚ beds of volcanic lava or tuff‚ or even along the direction of foliation in metamorphic rock. Good examples are the Salisbury crags in Edinburgh‚ which are formed by a sill partially exposed by the ice age. Dyke: Similar to a sill‚ except the lava has intruded along cracks and faults in one particular rock type. It cuts across layers‚ or through one layer or an unlayered rock‚ rather
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constantly moving and may crash into each other or slide or move apart from each other. Continental Plate: Large sections of the surface of the Earth that move separately. Shield Volcano: Volcanoes formed by viscous lava and have broad and flat sides. This happens due to the lava cooling slowly which lets it spread widely before cooling. Magma: Molten or partly molten rock underneath the Earth’s surface. Seismic Activity: Release of energy from the focus of an earthquake that spread outwards
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After the gigantic shaking of Mount Vesuvius it was calm for a few minutes‚ people were screaming‚ scared to death‚ and curious. Then toxic gas came out of Mount Vesuvius. Pompeii villagers thought it was a friendly mountain. Villagers started choking to death! Tranio and Livia found a safe place from the toxins. But then the gas stopped. Livia and Tranio came out 300 people were still alive about 4‚000‚000 human beings died. They wanted to explore the Mountain because they thought it was calm. Livia
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underneath the earth ’s upper mantle‚ part of the crust‚ works its way to the surface. At the surface‚ it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt‚ it will get bigger and bigger because the lava that flows over the top produces a new layer of earth. Lava and ash shoot up through the opening‚ and burst over the top or fill the air with lava fragments and ash. There have been around 1500 total calculated volcanos since the first recordings in history. Today
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It has had 33 eruptions and in most of the eruptions‚ an earthquake has preceded the eruption. The most famous eruptions occurred in 1950 and 1984. On June 1‚ 1950‚ lava erupted from a 20 km long fissure along the middle portion of the rift zone. The lava
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FSTG111 Exploring the Earth Assignment 1 Study Figure I-1 and answer the following questions: (a) With which type of plate boundary are most of the modern volcanoes associated? _______________________________________________________________________ (b) Identify the following volcanoes and indicate the plate-tectonic environment of each (all of these are listed in Table 1): Volcano Plate 1. Mount St. Helens‚ WA 2. Kilauea‚ Hawaii 3. Krakatoa‚ Indonesia Tectonic Environment -----------------------
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years (rough estimate at best)‚ Mt. Saint Helen’s is the most active volcano of the Cascade Mount Range. With its last eruption between the years of 2004-2008 where 92 million cubic meters erupted from the lava dome. (USGS 2004). There are several hazards associated with Mt. Saint Hellen’s. Lava domes‚ lahars‚ pyroclastic flows‚
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electron from the inner shell and thus transforming a positively charged particle (proton) into a neutral particle (neutron). Since lava is liquid‚ any argon-40 gas previously trapped in lava will be able to escape as gas is less dense than liquid. When there is no argon gas in the lava‚ it is known as the zero point (zero argon trapped in lava). As soon as the lava solidifies‚ there are no outlets for argon-40 gas to
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