Is Mount St. Helens a sheild volcano, composite volcano, a cinder cone, or lava dome?

Question

How can you tell and what characteristic of the volcano tells you .

Answer 1

Mount St. Helens Volcano is a Lava Dome Volcano.

A Shield Volcano is a broad one with slow flowing lava and huge quantizes of basaltic lava that build a gradual dome. It is a slow process of eruption.

A Cinder Cone Volcano is the stereotypical triangular shaped volcano that pours lava down the sides. Since Mt. St. Helens blew out its side it didn’t form the classic triangular shape. Also a Cinder Volcano has a gradual eruption that builds up the sides often they only erupt once. All volcanoes form a cinder cone at some point, but when they plug themselves up with a lava plug then they can become a lava dome volcano.

A Lava Dome Volcano is one that has a domed plug of lava which suddenly gives way. It happens as an explosion and it often rips out the side; just like Mount St. Helens. Often there are some earth tremors before the sudden and explosive eruption.

A Composite volcano would have several characteristics in common with all types of volcanoes. Mt. St. Helens isn’t steep sided enough to be a Cinder Cone, and it is too steep to be a Shield Volcano.

According to Wikipedia: http://en.wikipedia.org/wiki/Lava_dome
“Some of the world's most famous active lava domes include those at Mount Merapi in central Java of Indonesia, Soufrière Hills in Montserrat, and Mount St. Helens in Washington. Lassen Peak in northern California, is one of the largest lava domes in the world and has the distinction of being the only other Cascade volcano besides Mount St. Helens to have erupted (1914–1921) in the 20th Century.

According to Wikipedia: http://en.wikipedia.org/wiki/Volcano#Shield_volcanoes
Shield Volcanoes
“Hawaii and Iceland are examples of places where volcanoes extrude huge quantities of basaltic lava in effusive eruptions that gradually build a wide mountain with a shield-like profile. Their lava flows are generally very hot and very fluid, contributing to long flows. The largest lava shield on Earth, Mauna Loa, rises over 9,000 m from the ocean floor, is 120 km in diameter and forms part of the Big Island of Hawaii, along with other shield volcanoes such as Mauna Kea and Kīlauea.

According to Wikipedia: http://en.wikipedia.org/wiki/Cinder_cone
Cinder Cones
”Volcanic cones or cinder cones result from eruptions that erupt mostly small pieces of scoria and pyroclastics (both resemble cinders, hence the name of this volcano type) that build up around the vent. These can be relatively short-lived eruptions that produce a cone-shaped hill perhaps 30 to 400 meters high. Most cinder cones erupt only once. Cinder cones may form as flank vents on larger volcanoes, or occur on their own. Parícutin in Mexico and Sunset Crater in Arizona are examples of cinder cones.

According to Wikipedia: http://en.wikipedia.org/wiki/Stratovolcano
Stratovolcanoes or Composite Volcanos
“A stratovolcano, also called a composite volcano, is a tall, conical volcano composed of many layers of hardened lava, tephra, and volcanic ash. These volcanoes are characterized by a steep profile and periodic, explosive eruptions. The lava that flows from them is viscous, and cools and hardens before spreading very far. The source magma of this rock is classified as acidic, having high to intermediate levels of silica (as in rhyolite, dacite, or andesite). This is in contrast to less viscous basic magma that forms shield volcanoes (such as Mauna Loa in Hawaii), which have a wide base and more gently sloping profile.”

Answer 2

Cinder Volcano Examples

Answer 3

Mt St Helens is a Composite volcano. Three basic types of volcanoes are recognized by geologists. 1. Shield, with its broad, gently sloping form, made of once fluid lavas. Mauna Loa is the type example. 2. Cinder cones, steep sided (25-33 degrees), made of fragments of lava that were spit out of the volcano. Most of these cones are small (100's of meter across, although some get large, several kms). Mauna Kea has some of these cones as does Waianae. 3. Composite or strato-volcanoes are composed of once pasty lavas and layers of lava fragments (from explosive eruptions). It has gentle to moderate slopes on flanks and is steep near the summit. Usually smaller than shields but larger than cinder cones. Some of these volcanoes, like Crater Lake volcano, have cinder cones on it.

Answer 4

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A stratovolcano, also called a composite volcano, is a tall, conical volcano composed of many layers of hardened lava, tephra, and volcanic ash. These volcanoes are characterized by a steep profile and periodic, explosive eruptions. The lava that flows from them is viscous, and cools and hardens before spreading very far.

Answer 5

# Name: St. Helens
# Type: Stratovolcano
# Elevation: 2549 meters / 8362.76 feet
# Latitude: 46.2000
# Longitude: -122.18
# Location: US-Washington
# Status: Historical
# Last Eruption: 1964 or later

Answer 6

Try this:

http://en.wikipedia.org/wiki/Mount_St._Helens

Answer 7

it is a composite also known as stratovolcano
it is tall and has many layers

Answer 8

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