Like what does it spew, stuff like that.
2006-07-28 18:15:15 · 5 answers · asked by Leilei 2 in Education & Reference ➔ Homework Help
Molten rock and ash.
2006-07-28 18:18:28 · answer #1 · answered by Texas Cowboy 7 · 1⤊ 0⤋
I think what the persons saying if Mount St. Helens is an active or a dormant volcanic mountain.
2006-07-29 01:21:15 · answer #2 · answered by falcongrl89 3 · 0⤊ 0⤋
stratovolcano
A stratovolcano is a tall, conical mountain (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 flows that form them are highly viscous, and so cool and harden before spreading very far. The source magma of this rock is classified as acidic, or high in silica to intermediate (rhyolite, dacite, andesite, or basalt). This is in contrast to less viscous basic magma that forms shield volcanoes (such as Mauna Loa in Hawaii), which has a wide base and more gently sloping profile. Many stratovolcanos exceed a height of 2500 m.
Stratovolcanoes are a by-product of the subduction of tectonic plates. The source melts of these volcanoes arise as a result of the dewatering of oceanic crust at specific pressure/temperature conditions as the plate subducts to lower depths. The water freed from the subducting slab allows partial melting of the overlying mantle rock, which rises due to its lower density relative to the surrounding mantle rock, and pools at the base of the crust. The melt is initially basic in composition, but as it rises through the crust, it incorporates more acidic adjacent crustal rock, leading to a final intermediate composition. The water remains in the melt and upon eruption conributes to the explosive power of these volcanoes as superheated steam.
Although stratovolcanoes are sometimes called composite volcanoes, volcanologists prefer to use the term stratovolcano to distinguish among volcanoes because all volcanoes of any size have a composite (layered) structure — that is, are built up from sequential outpourings of eruptive materials.
2006-07-29 01:20:01 · answer #3 · answered by Amy 5 · 1⤊ 0⤋
This mountain is located in the ring of fire. Sometimes referred as St. Elmo's fire.
It spews out hot molten rock than emerges from the earth's core. This is melted rock that if hotter than 2000 degrees F.
2006-07-29 01:21:02 · answer #4 · answered by thunderbomb90 3 · 0⤊ 0⤋
magma ,lava, and volcanic ash
2006-07-29 01:18:28 · answer #5 · answered by I-C-U 5 · 0⤊ 0⤋