Notes -
... States. Fifty-seven people were killed; and 250 homes, 47 bridges, 24 km of railways and 300 km of highway were destroyed. The eruption caused a massive debris avalanche, reducing the elevation of the mountain's summit from 2,950 m to 2,550 m, and replacing it with a 1.5 km-wide horseshoe-shaped cra ...
... States. Fifty-seven people were killed; and 250 homes, 47 bridges, 24 km of railways and 300 km of highway were destroyed. The eruption caused a massive debris avalanche, reducing the elevation of the mountain's summit from 2,950 m to 2,550 m, and replacing it with a 1.5 km-wide horseshoe-shaped cra ...
Volcanoes
... Dormant- are not currently erupting but are considered likely to do so. Mt. St Helens was dormant for 123 years before it erupted in 1980. ...
... Dormant- are not currently erupting but are considered likely to do so. Mt. St Helens was dormant for 123 years before it erupted in 1980. ...
Chapter 6 Volcanoes
... Four major kinds of pyroclastic materials &descriptions: 1.Volcanic blocks- largest pieces, of solid rock 2.Volcanic bombs- largest blobs of magma harden in the air, shape of bomb. 3.Lapilli- “little stone” little bits of magma become solid before hit the ground 4.Volcanic ash- forms when magma expa ...
... Four major kinds of pyroclastic materials &descriptions: 1.Volcanic blocks- largest pieces, of solid rock 2.Volcanic bombs- largest blobs of magma harden in the air, shape of bomb. 3.Lapilli- “little stone” little bits of magma become solid before hit the ground 4.Volcanic ash- forms when magma expa ...
Volcanoes: eruptive style and associated landforms
... 2. Large volume of material extruded 3. Magma chamber empties 4. Volcano collapses into the empty magma chamber ...
... 2. Large volume of material extruded 3. Magma chamber empties 4. Volcano collapses into the empty magma chamber ...
Why Do Volcanoes Erupt? A Step by Step Guide
... molten rock, called magma, rises up into the mountain and the mountain is ready to erupt. When the volcanoes in Hawaii, like this one, erupt, the magna, the molten rock, flows out like lava, but when the scientists studied Mt. St. Helens, they found that the magma was very thick and gooey. It could ...
... molten rock, called magma, rises up into the mountain and the mountain is ready to erupt. When the volcanoes in Hawaii, like this one, erupt, the magna, the molten rock, flows out like lava, but when the scientists studied Mt. St. Helens, they found that the magma was very thick and gooey. It could ...
Chapter 5 and 6 Test Study Guide
... 6. How does the amount of silica affect how a volcano will erupt? Low silica content magma will erupt quietly while high silica content magma will erupt explosively. (p224-225) 7. List the hazards from quiet and explosive volcanic eruptions. A quiet volcanic eruption is hazardous because lava flows ...
... 6. How does the amount of silica affect how a volcano will erupt? Low silica content magma will erupt quietly while high silica content magma will erupt explosively. (p224-225) 7. List the hazards from quiet and explosive volcanic eruptions. A quiet volcanic eruption is hazardous because lava flows ...
The 1996 Surtseyan Type Eruption in Karymskoye Intracaldera Lake
... basaltic magma of ~10 millions kg/s occurred in Karymskoe caldera lake. Initial water depth above the eruption vent was ~50 m. Characteristics of the deposits together with analyses of videotape of several explosions have allowed us to model the eruptive events. Initial vent-clearing phreatic explos ...
... basaltic magma of ~10 millions kg/s occurred in Karymskoe caldera lake. Initial water depth above the eruption vent was ~50 m. Characteristics of the deposits together with analyses of videotape of several explosions have allowed us to model the eruptive events. Initial vent-clearing phreatic explos ...
Popular classification of volcanoes
... Super-volcano: the great devastator A super-volcano is a large volcano that usually has a large caldera and can potentially produce devastation on an enormous, sometimes continental, scale. Such eruptions would be able to cause severe cooling of global temperatures for many years afterwards because ...
... Super-volcano: the great devastator A super-volcano is a large volcano that usually has a large caldera and can potentially produce devastation on an enormous, sometimes continental, scale. Such eruptions would be able to cause severe cooling of global temperatures for many years afterwards because ...
Volcano and Mountain Review Sheet
... ii. Mountain covers a large area, sides are gently sloped, dome-shaped c. Composite cone i. Explosive eruption then a quiet eruption follows ii. Mountain is large, sides are steep, and mountain is cone-shaped Mountains 1. Definitions: a. Mountain ...
... ii. Mountain covers a large area, sides are gently sloped, dome-shaped c. Composite cone i. Explosive eruption then a quiet eruption follows ii. Mountain is large, sides are steep, and mountain is cone-shaped Mountains 1. Definitions: a. Mountain ...
Getting to Know: Effects of Volcanoes
... Volcanic eruptions can harm ecosystems and habitats in several ways. The lava and ash released by a volcano can kill or displace organisms. Volcanoes also have giant flows of gas and rock called pyroclastic flows. Pyroclastic flows can be extremely hot and can cause wildfires that destroy habitat. A ...
... Volcanic eruptions can harm ecosystems and habitats in several ways. The lava and ash released by a volcano can kill or displace organisms. Volcanoes also have giant flows of gas and rock called pyroclastic flows. Pyroclastic flows can be extremely hot and can cause wildfires that destroy habitat. A ...
volcanoes - TeacherXin
... – Both type of eruptions can cause damage far from the crater’s rim – Quiet eruption: • Lava flows from vents, setting fire to and then burying everything in its path. It can cover large areas with a thick layer of lava ...
... – Both type of eruptions can cause damage far from the crater’s rim – Quiet eruption: • Lava flows from vents, setting fire to and then burying everything in its path. It can cover large areas with a thick layer of lava ...
Document
... --both lava flows & tephra --andesitic lava / found “near” coasts --medium amount of silica ...
... --both lava flows & tephra --andesitic lava / found “near” coasts --medium amount of silica ...
Section
... Unlike Kilauea, Mount St. Helens has a more silicic, viscous, stiff, gas-charged lava in which pressure can build up to cause an explosive eruption. Mount St. Helens is a volcano with predominantly andesitic magma as is characteristic of subductionzone volcanoes. 4. What are pyroclastics? Identify a ...
... Unlike Kilauea, Mount St. Helens has a more silicic, viscous, stiff, gas-charged lava in which pressure can build up to cause an explosive eruption. Mount St. Helens is a volcano with predominantly andesitic magma as is characteristic of subductionzone volcanoes. 4. What are pyroclastics? Identify a ...
Section 13
... eruptions be more likely to increase the steepness of a volcanic cone? Explain your answer. Explosive eruption are more likely to increase volcano height, because the pyroclastic materials rise upward and fall close to the volcanic vent. ...
... eruptions be more likely to increase the steepness of a volcanic cone? Explain your answer. Explosive eruption are more likely to increase volcano height, because the pyroclastic materials rise upward and fall close to the volcanic vent. ...
Natural Disaster Project Top Ten Volcanic Eruptions Rank Event
... city of Shimabaraon the island of Kyūshū, Japan’s southernmost main island.In 1792, the collapse of one of its several lava domes triggered a tsunami that killed about 15,000 people in Japan’s worst-ever volcanic-related disaster. The volcano was most recently active from 1990 to 1995, and a large e ...
... city of Shimabaraon the island of Kyūshū, Japan’s southernmost main island.In 1792, the collapse of one of its several lava domes triggered a tsunami that killed about 15,000 people in Japan’s worst-ever volcanic-related disaster. The volcano was most recently active from 1990 to 1995, and a large e ...
notable events and disasters of 2014. highlights of volcanic eruptions
... HIKERS RETURNING: SATURDAY, SEPTEMBER 27, 2014 ...
... HIKERS RETURNING: SATURDAY, SEPTEMBER 27, 2014 ...
Volcano Worksheet
... 8. Describe the three types of volcanoes. _____________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ ____________________________ ...
... 8. Describe the three types of volcanoes. _____________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ ____________________________ ...
VolcanicHazards2
... neighborhoods, such as the one shown here, can be evacuated. Buildings and other human-made structures are not so lucky! ...
... neighborhoods, such as the one shown here, can be evacuated. Buildings and other human-made structures are not so lucky! ...
Mount St. Helens
Mount St. Helens or Louwala-Clough (known as Lawetlat'la to the indigenous Cowlitz people, and Loowit to the Klickitat) is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 km) south of Seattle, Washington, and 50 miles (80 km) northeast of Portland, Oregon. Mount St. Helens takes its English name from the British diplomat Lord St Helens, a friend of explorer George Vancouver who made a survey of the area in the late 18th century. The volcano is located in the Cascade Range and is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows.Mount St. Helens is most notorious for its catastrophic eruption on May 18, 1980, at 8:32 a.m. PDT, the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles (24 km) of railways, and 185 miles (298 km) of highway were destroyed. A massive debris avalanche triggered by an earthquake measuring 5.1 on the Richter scale caused an eruption that reduced the elevation of the mountain's summit from 9,677 ft (2,950 m) to 8,363 ft (2,549 m), replacing it with a 1 mile (1.6 km) wide horseshoe-shaped crater. The debris avalanche was up to 0.7 cubic miles (2.9 km3) in volume. The Mount St. Helens National Volcanic Monument was created to preserve the volcano and allow for its aftermath to be scientifically studied.As with most other volcanoes in the Cascade Range, Mount St. Helens is a large eruptive cone consisting of lava rock interlayered with ash, pumice, and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted. The largest of the dacite domes formed the previous summit, and off its northern flank sat the smaller Goat Rocks dome. Both were destroyed in the 1980 eruption.