from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology A segment of the crust of the Earth that bends downward


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  • Contemporaneous lava flows interbedded with the strata show that volcanic action accompanied the downwarp, and that molten rock was driven upward through fissures in the crust and outspread over the sea floor in sheets of lava.

    The Elements of Geology


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