Due Date:_________________________


    • 2. An igneous rock rich in the elements magnesium and iron (also called "ferromagnesian").
    • 5. A narrow, igneous intrusion that characteristically cuts across bedding planes and older rocks.
    • 7. Classification for a volcano that has erupted during the past, but has not been recently active.
    • 8. Generalized class of the ultramafic igneous rocks typical of the earth's mantle.
    • 11. The layer or zone of the lithosphere between the crust and the outer core.
    • 12. The most common type of volcanic rock.
    • 13. Fine and micro-fine volcanic particulates.
    • 15. Generalized term for aerially ejected volcanic debris.
    • 17. Magma which reaches the earth's surface, thereby losing volatile (gas) components.
    • 19. Lense-shaped igneous intrusion that commonly penetrates between bedding planes of older rock.
    • 23. A very hot cloud of incandescent volcanic ash that often moves down slope at great speed (2 words).
    • 25. A relatively stationary plume of hot mantle rock that produces volcanic chains such as Hawaii.
    • 26. Generalized term for a volcanic conduit located at the earth's surface.
    • 27. The collapsed crater of an extinct volcano.
    • 29. The driving force for volcanism is the flow of the earth's internal - - - -.
    • 30. A volcanic rock produced by the mixture of felsic and mafic rocks at a convergent plate boundary.



    • 1. A zone inside the earth showing a change in the speed of seismic waves, due to change in rock types.
    • 3. A bowl-shaped topographic depression; may be an erosional remnant of an extinct volcano.
    • 4. Typical shape of a basalt volcano, produced by the relatively fluid lava.
    • 5. Typical shape of volcanoes of felsic or andesitic composition.
    • 6. A volcano that is unlikely to erupt again, evidenced by erosion of its structure.
    • 8. Braided, rope-shaped lava characteristic of basalt volcanoes (a Hawaiian word).
    • 9. The type of volcanic feature produced by undersea volcanism at divergent plate boundaries.
    • 10. The abundance of this mineral in lava usually produces violent, explosive volcanic eruptions.
    • 11. Molten rock that originates from the earth's mantle, rising upwards due to lower density.
    • 12. A very large body of igneous rock located deep underground (sometimes called a pluton).
    • 14. A type of igneous intrusion that cuts horizontally through older rock.
    • 16. Felsic volcanic rock that has the same general mineral content as a granite.
    • 18. Description of a steam explosion of a a volcanic cone, caused by seawater mixing with lava.
    • 20. The shape of a volcano composed largely of cinders.
    • 21. A flow or avalanche of boiling mud, caused by the melting of snow by the eruption of hot volcanic ash.
    • 22. Classification of any volcano that has erupted within the human historical record.
    • 24. A volatile gas such as hydrogen sulfide is easily detected because it _ _ _ _ _ _ .
    • 28. Blocky, jagged, clinkery lava (Hawaiian word).
    Copyright © 1989 by William K. Tong