Plate Tectonics and Volcanic Activity ... Mount St. Helens, Washington, is a stratovolcano that had an explosive Plinian eruption in 1980. A convergent plate boundary is the area of collision between two tectonic plates. This is similar to what we see on the northwest coast of the United States, the Andes Mountains, and Japan. Examples of subduction-related stratovolcanoes can be found in many places in the world, but they are particularly abundant along the rim of the Pacific Ocean, a region known as Ring of Fire . Composite and shield volcanoes are found along plate boundaries. Formation Stratovolcanoes form at subduction zones , where one plate at a tectonic boundary is pushed below another. ... it was a convergent of divergent because it is a stratovolcano. Santa Maria Volcano Geology and Hazards. They have distinctive characteristics and can have both positive and negative effects on people and the landscape. Fined grained vs coarse grained is an igneous rock classification based on. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and periodic intervals of explosive eruptions and effusive eruptions, although some have collapsed summit craters called calderas. Santa María is a ~30,000 year old andesitic stratovolcano built on a basement of older rocks formed by ancient volcanic eruptions. A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Mount Rainier is located on the Juan de Fuca Plate and it is a divergent boundary. Divergent plate boundary basaltic mid-ocean ridge; fissures and vents; shield volcanoes lava flows; ejecta mid-ocean ridges, Iceland Intracontinental exension basaltic or bimodal silicic/basaltic varied: fissures and vents, flood eruptions, cinder cones, stratovolcanoes, caldera complexes The eruption produced the largest landslide in recorded history, covering a 36-kilometer (14-mile) area of land with ash … It is a massive Stratovolcano that has an elevation of 14,411 feet. Divergent. Mount Rainier is the highest mountain in the Cascade Mountain Range, and is considered one of the most dangerous volcanoes in the world. Stratovolcanoes tend to form at subduction zones, or convergent plate margins, where an oceanic plate slides beneath a continental plate and contributes to the rise of magma to the surface. The last place volcanoes typically form are convergent plate boundaries. ... Stratovolcano (composite volcano) Stratovolcanoes are common along which type of plate tectonic boundary? Convergent plate boundary. Lava, rocks, and ash from a stratovolcano either flow a short distance from the cone or explosively eject into the air before falling back down toward the source. Mount Rainier is located in southeastern Seattle, Washington. In what plate tectonic boundary settings is 3/4th of all extrusive rock produced? Stratovolcanoes typically form at convergent plate margins, where one plate descends beneath an adjacent plate at the site of a subduction zone. At rift zones, or divergent margins, shield volcanoes tend to form as two oceanic plates pull slowly apart and magma effuses upward through the gap. The 0.5 km3 (0.1 mi3) crater in the south flank of the volcano exposes a spectacular sequence of alternating pyroclastic and lava flows and lahar deposits. 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