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  2. Surface exposure dating - Wikipedia

    en.wikipedia.org/wiki/Surface_exposure_dating

    Surface exposure dating is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth's surface. Surface exposure dating is used to date glacial advances and retreats, erosion history, lava flows, meteorite impacts, rock slides, fault scarps, cave development, and other geological events.

  3. Global Boundary Stratotype Section and Point - Wikipedia

    en.wikipedia.org/wiki/Global_Boundary_Stratotype...

    "Chart of The Global Boundary Stratotype Sections and Points (GSSP): chart". stratigraphy.science.purdue.edu. Archived from the original on 2022-06-30. "GSSP Table - All Periods". timescalefoundation.org. Archived from the original on 2023-11-30. "GSSPs and Continental drift 3D views". ghkclass.net. Archived from the original on 2023-12-08.

  4. Aspect (geography) - Wikipedia

    en.wikipedia.org/wiki/Aspect_(geography)

    In physical geography and physical geology, aspect (also known as exposure) [1] is the compass direction or azimuth that a terrain surface faces. [ 2 ] For example, a slope landform on the eastern edge of the Rockies toward the Great Plains is described as having an easterly aspect .

  5. Surface weather observation - Wikipedia

    en.wikipedia.org/wiki/Surface_weather_observation

    Surface weather observations are the fundamental data used for safety as well as climatological reasons to forecast weather and issue warnings worldwide. [1] They can be taken manually, by a weather observer, by computer through the use of automated weather stations , or in a hybrid scheme using weather observers to augment the otherwise ...

  6. 2020 in science - Wikipedia

    en.wikipedia.org/wiki/2020_in_science

    China successfully launches Tianwen-1, its first rover mission to Mars, with a planned surface landing date of 23 April 2021. [ 2 ] Astronomers report the observation of a " hard tidal disruption event candidate " associated with ASASSN-20hx, located near the nucleus of galaxy NGC 6297, and noted that the observation represented one of the ...

  7. Ballantine scale - Wikipedia

    en.wikipedia.org/wiki/Ballantine_Scale

    Semibalanus balanoides, a species of acorn barnacle, Ballantine's main indicator of a medium exposure in the mid-littoral zone.. The Ballantine scale is a biologically defined scale for measuring the degree of exposure level of wave action on a rocky shore.

  8. Stock (geology) - Wikipedia

    en.wikipedia.org/wiki/Stock_(geology)

    A stock of nordmarkite (quartz-alkali syenite) of Triassic age, in the Gevanim Valley, Makhtesh Ramon, southern Israel.. In geology, a stock is an igneous intrusion that has a surface exposure of less than 100 square kilometres (40 sq mi), [1] [2] differing from batholiths only in being smaller.

  9. Exposure assessment - Wikipedia

    en.wikipedia.org/wiki/Exposure_assessment

    Exposure analysis is the science that describes how an individual or population comes in contact with a contaminant, including quantification of the amount of contact across space and time. 'Exposure assessment' and 'exposure analysis' are often used as synonyms in many practical contexts. Risk is a function of exposure and hazard.