Composite Volcanoes (Stratovolcanoes)
https://youtube.com/watch?v=9wRAyQiAcwk
What type of volcanoes is Mt. St. Helens?
Mount St. Helens is a stratovolcano, a steep-sided volcano located in the Pacific Northwest region of the United States in the state of Washington.
What type of volcanoes are Mt Rainier Mt. St. Helens and Mt Shasta?
Mazama, Shasta, Lassen, Hood, Rainier and famous Mt. St. Helens are composite volcanoes, as are many of the Earth’s grandest mountains, like Mt.
Is Mt. St. Helens a shield or composite volcano?
stratovolcano
Mount St. Helens is an example of a composite or stratovolcano. These are explosive volcanoes that are generally steep-sided, symmetrical cones built up by the accumulation of debris from previous eruptions and consist of alternating layers of lava flows, volcanic ash and cinder.
Are Mt Rainier and Mt. St. Helens the same?
Mount Rainier stands about 65 miles southeast of Seattle, and on clear day the 14,411-foot-tall peak is visible from the city. Mount St. Helens Volcanic Monument rises 90 miles south of Rainier, and the scars of the volcano’s 1980 eruption are visible throughout the rugged landscape.
Is Mt. St. Helens a lava volcano?
Lava flows from Mount St. Helens typically affect areas within 6 mi (10 km) of the vent. However, two basalt flows erupted about 1,700 years ago extended about 10 mi (16 km) from the summit; one of them contains the Ape Cave lava tube.
What type of volcano is Mt. St. Helens quizlet?
Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States.
What type of volcano is Mount Rainier in what state is it located?
Mount Rainier (/reɪˈnɪər/), also known as Tahoma, Tacoma, Tacobet, or təqʷubəʔ, is a large active stratovolcano in the Cascade Range of the Pacific Northwest, located in Mount Rainier National Park about 59 miles (95 km) south-southeast of Seattle.
Is Mount Rainier a volcanic arc?
Mount Rainier (Figure 2.1) is one of about two dozen recently active volcanoes in the Cascade Range, a volcanic arc formed by subduction of the Juan de Fuca plate beneath the North American plate. Volcanism in this arc began at least 37 million years ago and has continued intermittently to the present.
What type of volcano is Mt Rainier Washington quizlet?
ALSO CALLED STRATOVOLCANO. A cone-shaped volcano whose steep sides are formed by loose, fragmented cinders that fall to the Earth close to the vent.
What type of volcano is Mount Rainier?
stratovolcano
Mount Rainier is an episodically active composite volcano, also called a stratovolcano. Volcanic activity began between one half and one million years ago, with the most recent eruption cycle ending about 1,000 years ago.
What are shield volcanoes?
Where a volcano produces low viscosity, runny lava, it spreads far from the source and forms a volcano with gentle slopes: a shield volcano. Most shield volcanoes are formed from fluid, basaltic lava flows. Mauna Kea and Mauna Loa are shield volcanoes.
What is a shield and composite volcano?
What is the main difference between a shield volcano and a composite volcano? The main difference between the two is that a shield volcano is composed of basaltic lava while a composite volcano is composed of andesitic magma.
What volcanoes are similar to Mt St Helens?
Despite being in geologically similar settings, Chaitén Volcano and Mount St. Helens have very different shapes. Both volcanoes are fueled by the thick lavas that are common in subduction zones, where one piece of Earth’s crust (a tectonic plate,) overrides another.
Is Mount Rainier an old volcano?
500,000 years ago marks the beginning of the voluminous and continuous volcanic rock record that we call Mount Rainier. For the first approximately 80,000 years the new volcano was highly active, producing a thick apron of pyroclastic flows that are well exposed above Glacier Basin.
How close are Mt Rainier and Mt St Helens?
approximately 50 miles
Mount St. Helens is 34 miles (55 km) west of Mount Adams, in the western part of the Cascade Range. Considered “brother and sister” mountains, the two volcanoes are approximately 50 miles (80 km) from Mount Rainier, the highest of the Cascade volcanoes.
What type of volcano is Mount St. Helens and what caused the explosion?
Mount St. Helens, a stratovolcano or composite volcano located in Washington State, USA (46.2º latitude north, 122.2º longitude west,) erupted violently on the Sunday morning of May 18th 1980 at precisely 8:32.
Is Mt. St. Helens a dead volcano?
Mount St. Helens is the most active volcano in the contiguous United States, which makes it a fascinating place to study and learn about.
What type of lava is St Helens?
The basalt magma erupted by Kīlauea contains about 52% silica and about 0.5 % water while the dacite lava erupted by Mount St. Helens in 1980 contained more of both: about 64% silica and about 4% water.
What type of volcano is Mount St. Helens and what caused the explosion quizlet?
What type of volcano is Mount St. Helens and what caused the explosion? It is a strato-volcano that exploded when trapped gasses were quickly released. The most violent volcanic eruptions occur when gasses cannot easily escape from the magma.
Is Mt St Helens Plinian?
The May 18, 1980 eruption of Mount St. Helens was Plinian. The 1912 eruption of Novarupta in Katmai National Park and Preserve also was Plinian. It produced an eruption column that rose to a height of more than 100,000 feet (30 km) and spread over most of southern Alaska and the Yukon Territory.