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4
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this is created when volcanic ash is propelled into the atmosphere during an eruption.
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6
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a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems
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9
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a linear feature that exists between two tectonic plates that are moving away from each other.
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12
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an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide
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13
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an opening exposed on the earth's surface where volcanic material is emitted.
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14
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a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash
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15
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a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading.
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16
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a boundary where two tectonic plates collide and, because of differences in density, one dives beneath the other.
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18
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hot molten or semifluid rock erupted from a volcano or fissure, or solid rock resulting from cooling of this.
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19
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How many major plates are there?
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20
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hot fluid or semifluid material below or within the earth's crust from which lava and other igneous rock is formed by cooling
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1
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a circular depression in the ground caused by volcanic activity. It is typically a basin, circular in form within which occurs a vent (or vents) from which magma erupts as gases, lava, etc.
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2
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a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates that move slowly over the underlying mantle
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3
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a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill.
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5
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a channel for conveying lava up and out of the volcano
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7
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the powdery residue left after volcano's explosion
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8
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a long, narrow ditch.
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10
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mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust
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11
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a mound of viscous lava that has been extruded from a volcanic vent.
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17
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where two plates slide past one another
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