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igneous rock

igneous rock in Culture
igneous rock [(ig-nee-uhs)]

Rocks formed by the cooling and solidifying of molten materials. Igneous rocks can form beneath the Earth's surface, or at its surface, as lava.

Note: Granite, solid volcanic lava, and basalt are examples of igneous rock.
The American HeritageĀ® New Dictionary of Cultural Literacy, Third Edition
Copyright Ā© 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Examples from the Web for igneous rock
Historical Examples
  • I did not see any eruption of igneous rock on any part of the day's journey.

  • An igneous rock is one which has been consolidated from a state of fusion.

  • How may granite be at one and the same time a metamorphic and igneous rock?

    Geology James Geikie
  • What relation do they occasionally bear to sheets of igneous rock?

    Geology James Geikie
  • Near Downhead there is an isolated outburst of igneous rock.

    Somerset G.W. Wade and J.H. Wade
  • The beacons were found to be part of a horizontal, stratified series of sandstones underlying the igneous rock.

    The Home of the Blizzard Douglas Mawson
  • For instance, an igneous rock may become a schist without going through the intermediate stage of sedimentation.

  • In igneous rock the ore-bearing solutions may have altered the wall rock to a dense mixture of quartz, sericite, and chlorite.

  • Should hard limestone or igneous rock be met with, the rate of progress may be less than half the above general average.

  • The strata are bent down towards the central plug of igneous rock, and are generally more or less altered at the line of junction.

    Geology James Geikie

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