write a note of volcanic material
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Most volcanoes have a volcanic crater at the top. When a volcano is active, materials come out of it. The materials include lava, steam, gaseous sulfur compounds, ash and broken rock pieces. When there is enough pressure, the volcano erupts.
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A volcano is a mountain that has lava (hot, liquid rock) coming out from a magma chamber under the ground, or did have in the past. Volcanoes[1] are formed by the movement of tectonic plates.
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