geologic time

noun

Definition of geologic time

: the long period of time occupied by the earth's geologic history
geologic time table

Examples of geologic time in a Sentence

Recent Examples on the Web In recent geologic time, roughly every 100,000 years the planet plunges into the deep chill of an ice age (due to the shape of Earth’s orbit around the sun). Alexandra Witze, Smithsonian Magazine, "Why Some Geologists Say Charles Darwin’s Theory of Coral Atoll Formation Is Wrong," 3 Mar. 2021 These chemicals can linger on geologic time scales, explains Chris Higgins, a civil and environmental engineer at the Colorado School of Mines. Annie Sneed, Scientific American, "Forever Chemicals Are Widespread in U.S. Drinking Water," 22 Jan. 2021 In Nevada, old lime pits that will require geologic time to recover also could be used. AZCentral.com, "Tribes want Biden to balance technology and cultural issues in renewable energy projects," 18 Jan. 2021 Smooth expanses of ice along Europa’s face and tantalizing hints of water plumes suggest any liquid body below is seeping upward on a geologic time scale. Maya Wei-haas, National Geographic, "One of Jupiter's icy moons may glow in the dark," 9 Nov. 2020 By recycling carbon over geologic time, plate tectonics regulates the carbon dioxide in the atmosphere. Marcus Woo, Scientific American, "Stellar Smashups May Fuel Planetary Habitability, Study Suggests," 17 Nov. 2020 More extreme hothouse periods lurk in the deeper recesses of geologic time. Madeleine Stone, National Geographic, "Earth is setting heat records. It will be much hotter one day.," 20 Aug. 2020 Southwest reveals a series of sedimentary rock layers that reflect hundreds of millions of years of geologic time. Larry Bleiberg, USA TODAY, "From ancient trees to towering volcanoes, take in scientific wonders at national parks," 15 Aug. 2020 Scientists say the periodic exposure to the elements of big chunks of volcanic rock as a result of tectonic movement has, over a geologic time scale, influenced the Earth’s climate, even helping bring on ice ages. Peter Fimrite, SFChronicle.com, "Could putting pebbles on beaches help solve climate change?," 16 Dec. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'geologic time.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of geologic time

1861, in the meaning defined above

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Time Traveler for geologic time

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The first known use of geologic time was in 1861

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Statistics for geologic time

Last Updated

9 Mar 2021

Cite this Entry

“Geologic time.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/geologic%20time. Accessed 10 Apr. 2021.

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More from Merriam-Webster on geologic time

Britannica.com: Encyclopedia article about geologic time

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