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_______ from the mantle rises and flows out through a vent onto Earth's surface as _______. This molten material, sometimes along with ash, cinders, and rock, builds up a mountain around the vent. The vent and its mountain together are called a _______. A. Lava; magma; volcano B. Sediment; magma; fault-block mountain C. Magma; lava; volcano D. Magma; sediment; fault-block mountain