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.

Notes for igneous rock

Granite, solid volcanic lava, and basalt are examples of igneous rock.

Words Nearby igneous rock

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

How to use igneous rock in a sentence

  • 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
  • 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
  • How does a contemporaneous igneous rock affect the beds upon which it rests?

    Geology | James Geikie
  • What is a neck of intrusive igneous rock, and how have the strata surrounding it been affected?

    Geology | James Geikie
  • That is, a dike is a more or less vertical sheet of igneous rock which has cooled and crystallized in a fissure.

    North America | Israel C. Russell