Is it a Shield Cone, Compostie Cone, or a Cinder Cone?
Please help!! This is 4 a project!! Thank you all who kindly help!
2007-03-22 09:57:23 · 5 answers · asked by Ana Semphrey 2 in Science & Mathematics ➔ Earth Sciences & Geology
According to the USGS Mt. St. Helens is classified as a lava dome volcano. 5 volcano types: shield volcano (Mauna Loa), stratovolcano (Mt. Ranier), caldera (Crater Lake on Mt. Mazama), cinder cone (Lava Butte), lava dome (Mt. Saint Helens)
2007-03-26 04:05:53 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Mount St. Helens is a composite cone (also called a stratovolcano).
Composite cones are typified by their steep sides, violent eruptions, smaller size (compared to shield volcanoes), and their more felsic magma. A composite cone is composed of alternating layers of pyroclastic debris and lava flows - unlike a shield volcano which is formed from many layers of lava flows with very little pyroclastic debris. Composite cones like Mount St. Helens are found where a plate is subducting under continental crust (in this case, the oceanic Juan de Fuca plate is suducting under the continental North American plate).
It is definitely not a cinder cone. Cinder cones are very small compared to composite cones or shield volcanoes. They are formed rapidly from erupting magma. They are usually unconsolidated full of glassy rock full of air bubbles. Because of their fairly weak composition cinder cones disappear fairly quickly. They do not create huge mountains like Mount St. Helens.
2007-03-22 11:02:49 · answer #2 · answered by brooks b 4 · 0⤊ 0⤋
it is a cinder cone; shield cone volcanoes are like those in Hawali or Island Composite cone are from little erupting volcanoes and are made up of small bits of rock (such as Stromboli) Mt St Helens is a good eaxample of a solid rock cinder cone
hope this helps
2007-03-22 10:58:10 · answer #3 · answered by prof. Jack 3 · 0⤊ 0⤋
that's a Cascade Stratovolcano it is brought about by using the subduction of the Juan de Fuca plate below the North American plate. The subduction zone lies off the coast of Californnia, Oregon, Washington, and British Columbia, runs extra or less parallel to the coast approximately a hundred to 3 hundred miles from the coastline. the line of stratovolcanos boost from British Columbia south to Northern California. different cascade stratovolcanos incorporate Mt. Ranier, Mt. Adams, Mt. Bachelor, Crater Lake, Mt. Lassen, and Mt. Shasta.
2016-11-27 23:13:26 · answer #4 · answered by farlow 4 · 0⤊ 0⤋
composite or strato volcano
They are big mountain like ones...um or MOUNTAINS!
and they usually come with the rest of the pack....like Mt st helens partners in the cascades
2007-03-22 11:53:11 · answer #5 · answered by kat 3 · 0⤊ 0⤋