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2. An igneous rock rich in the elements magnesium and iron (also called
"ferromagnesian").
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5. A narrow, igneous intrusion that characteristically cuts across bedding
planes and older rocks.
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7. Classification for a volcano that has erupted during the past, but has
not been recently active.
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8. Generalized class of the ultramafic igneous rocks typical of the earth's
mantle.
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11. The layer or zone of the lithosphere between the crust and the outer
core.
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12. The most common type of volcanic rock.
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13. Fine and micro-fine volcanic particulates.
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15. Generalized term for aerially ejected volcanic debris.
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17. Magma which reaches the earth's surface, thereby losing volatile (gas)
components.
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19. Lense-shaped igneous intrusion that commonly penetrates between bedding
planes of older rock.
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23. A very hot cloud of incandescent volcanic ash that often moves down
slope at great speed (2 words).
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25. A relatively stationary plume of hot mantle rock that produces volcanic
chains such as Hawaii.
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26. Generalized term for a volcanic conduit located at the earth's surface.
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27. The collapsed crater of an extinct volcano.
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29. The driving force for volcanism is the flow of the earth's internal
- - - -.
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30. A volcanic rock produced by the mixture of felsic and mafic rocks at
a convergent plate boundary.
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1. A zone inside the earth showing a change in the speed of seismic waves,
due to change in rock types.
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3. A bowl-shaped topographic depression; may be an erosional remnant of
an extinct volcano.
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4. Typical shape of a basalt volcano, produced by the relatively fluid
lava.
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5. Typical shape of volcanoes of felsic or andesitic composition.
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6. A volcano that is unlikely to erupt again, evidenced by erosion of its
structure.
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8. Braided, rope-shaped lava characteristic of basalt volcanoes (a Hawaiian
word).
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9. The type of volcanic feature produced by undersea volcanism at divergent
plate boundaries.
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10. The abundance of this mineral in lava usually produces violent, explosive
volcanic eruptions.
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11. Molten rock that originates from the earth's mantle, rising upwards
due to lower density.
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12. A very large body of igneous rock located deep underground (sometimes
called a pluton).
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14. A type of igneous intrusion that cuts horizontally through older rock.
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16. Felsic volcanic rock that has the same general mineral content as a
granite.
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18. Description of a steam explosion of a a volcanic cone, caused by seawater
mixing with lava.
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20. The shape of a volcano composed largely of cinders.
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21. A flow or avalanche of boiling mud, caused by the melting of snow by
the eruption of hot volcanic ash.
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22. Classification of any volcano that has erupted within the human historical
record.
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24. A volatile gas such as hydrogen sulfide is easily detected because
it _ _ _ _ _ _ .
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28. Blocky, jagged, clinkery lava (Hawaiian word).
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