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1
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A crack or fracture in the earth's surface.
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5
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Molten rock beneath the surface of the earth.
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6
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A volcano that consists of a complex of two or more vents, or a volcano that has an associated volcanic dome, either in its crater or on its flanks.
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7
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A vent in the surface of the Earth through which magma and associated gases and ash erupt; also, the form or structure, usually conical, that is produced by the ejected material.
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9
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The subterranean cavity containing the gas-rich liquid magma which feeds a volcano.
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10
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The opening at the earth's surface through which volcanic materials issue forth.
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12
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A volcano which is presently inactive but which may erupt again.
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13
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A volcano composed of both lava flows and pyroclastic material.
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14
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When hot rocks and lava burst from a volcano.
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15
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An outpouring of lava onto the land surface from a vent or fissure.
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17
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A volcano that is erupting or has erupted within historical time and is considered likely to do so in the future.
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20
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The regions of mountain-building earthquakes and volcanoes which surround the Pacific Ocean.
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23
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Fine particles of rock dust blown from an explosion vent.
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2
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Volcanic ash that has fallen through the air from an eruption cloud.
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3
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A volcanic center, 60 to 120 miles across and persistent for at least a few tens of million of years, that is thought to be the surface expression of a persistent rising plume of hot mantle material.
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4
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Roman god of fire and the forge, after whom volcanoes are named.
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6
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A steep volcanic cone built by both lava flows and pyroclastic eruptions.
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8
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Magma which has reached the surface through a volcanic eruption. Streams of liquid rock that flow from a crater or fissure.
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11
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The process by which solid, liquid, and gaseous materials are ejected into the earth's atmosphere and onto the earth's surface by volcanic activity.
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16
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The zone of the earth below the crust and above the core.
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18
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A passage (pipe) followed by magma in a volcano.
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19
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A steep-sided, usually circular depression formed by either explosion or collapse at a volcanic vent.
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21
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Springs that throw boiling water high in the air. They are caused by volcanic heat warming trapped ground water.
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22
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Elongated fractures or cracks on the slopes of a volcano.
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