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Definition a science that deals with the history of the earth as recorded in rocks

or more rarely:

the rocks, minerals, and rock formations of an area
  • He majored in geology and went on to become expert at finding oil.
geology = a science that deals with the earth's physical structure and processes that affect it
  • Geology has favored the island with rich soil, but also threatens it with volcanic eruptions.
  • Natural selection can act only by the preservation and accumulation of infinitesimally small inherited modifications, each profitable to the preserved being; and as modern geology has almost banished such views as the excavation of a great valley by a single diluvial wave, so will natural selection, if it be a true principle, banish the belief of the continued creation of new organic beings, or of any great and sudden modification in their structure.
    Charles Darwin  --  The Origin of Species
  • Mac also developed a geological mania, and went tapping about at rocks and stones, discoursing wisely of "strata, periods, and fossil remains"; while Rose picked up leaves and lichens, and gave him lessons in botany in return for his lectures on geology.
    Louisa May Alcott  --  Eight Cousins
  • Two geological ages later, we heard the soles of Atticus's shoes scrape the front steps.
    Harper Lee  --  To Kill a Mockingbird
  • geological = related to a science that deals with the history of the earth as recorded in rocks
  • But this was concrete evidence; it was a fragment of the abolished past, like a fossil bone which turns up in the wrong stratum and destroys a geological theory.
    George Orwell  --  1984
  • geological = related to the science of the history of the earth as recorded in rocks
  • In geology class, the teacher, Mr. Dodge, was talking about the petrified wood forests near George, Washington, on the Columbia River, and how it was pretty amazing that wood could turn into rock.
    Sherman Alexie  --  The Absolutely True Diary of a Part-Time Indian
  • geology = a science that deals with the history of the earth as recorded in rocks
  • This suffering allowed them no rest; it was simple but relentless as a geologic cycle.
    Gish Jen  --  Typical American
    Alfred Bester  --  The Demolished Man
  • But Eagles was only a quiet old gentleman, husband to Mrs. Eagles, with a taste for geology, and not tall enough to reach anybody's ears.
    William Makepeace Thackeray  --  Vanity Fair
  • Is it biology or geology?
    Don DeLillo  --  White Noise
  • It was a risk, but I thought it was only a geological risk.
    V.S. Naipaul  --  A Bend in the River
  • And the Geological Cataclysm.
    Fyodor Dostoyevsky  --  The Brothers Karamazov
  • Who knows most about geology?
    Robert A. Heinlein  --  Tunnel In the Sky
  • "He's been talking himself hoarse for days, and the scribes are taking it all down-geology, mining, metallurgy, petroleum chemistry ...."
    Roger Zelazny  --  Lord of Light
  • I felt satisfaction because such a geology confirmed that I was right, that this island was a chimera, a play of the mind.
    Yann Martel  --  Life of Pi
  • His point was that even quite small changes could cause huge geological upheavals, considering the aeons of time that have elapsed.
    Jostein Gaarder  --  Sophie's World
  • This was taken in ill part by a great many people, who persisted in believing that Flintwinch was lying somewhere among the London geological formation.
    Charles Dickens  --  Little Dorrit
  • Depending upon the geology of a specific region, it is sometimes possible to hear, through the ground, a large group of cavalry as it approaches.
    Mark Helprin  --  A Soldier of the Great War
  • To me, at least in my present circumstances, these would be vastly more interesting than this spectacle of oldtime geology in decay.
    H.G. Wells  --  The Time Machine

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