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OCR: Stratovolcano Built by alternating layers, or strata, of erupted materials, such as lava and ash, stratovolcanoes are large, often steep volcanoes that sometimes have violent, explosive eruptions. Most stratovolcanoes (also known as composite volcanoes) crupt thick lava that cools and solidifies near the vent. As a result, their slopes Stratovolcano are steep, and debris from successive Stromboli Strombolian Eruption eruptions adds layers to the already Subduction Zone sheer escarpments. Flank cruptions, Submarine Eruption caused when magma travels outward Sulfur from a central conduit through channels T Thal Tambora known as dikes and sills, are common Tephra on stratovolcanoes. Notable Thales stratovolcanoes include Cotopaxi in Time Scales Tsunami Ecuador and Colima in Mexico. U Unzen US ...