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  2. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    The subtension is linear with the distance, for example, at 500 yards, 1 MOA subtends 5.235 inches, and at 1000 yards 1 MOA subtends 10.47 inches. Since many modern telescopic sights are adjustable in half ( ⁠ 1 / 2 ⁠ ), quarter ( ⁠ 1 / 4 ⁠ ) or eighth ( ⁠ 1 / 8 ⁠ ) MOA increments, also known as clicks , zeroing and adjustments are ...

  3. Shot grouping - Wikipedia

    en.wikipedia.org/wiki/Shot_grouping

    Expensive and well-machined match-grade pistols demonstrate a higher accuracy than normal handguns, capable of groupings of 1.25 inches at 25 yards, which is about 5 MOA (equivalent to about 30 mm at 25 meters, which is 1.2 mil).

  4. Geology of Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Pennsylvania

    The top plate illustrates the tectonic setting for the sediments of Pennsylvania. This section is characterized by the metamorphic rocks that provide much of the bedrock for this area. The oldest exposed rocks in Pennsylvania are found here and consist of the Baltimore Gneiss. [8] These rocks have a complex history and a vast array of different ...

  5. List of U.S. state soils - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_soils

    A state soil is a soil that has special significance to a particular state. Each state in the United States has selected a state soil, twenty of which have been legislatively established. These official state soils share the same level of distinction as official state flowers and birds .

  6. Critical state soil mechanics - Wikipedia

    en.wikipedia.org/wiki/Critical_state_soil_mechanics

    It's the point at which the soil cannot sustain any additional load without undergoing continuous deformation, in a manner similar to the behaviour of fluids. Certain properties of the soil, like porosity, shear strength, and volume, reach characteristic values. These properties are intrinsic to the type of soil and its initial conditions. [1]

  7. Allegheny Plateau - Wikipedia

    en.wikipedia.org/wiki/Allegheny_Plateau

    Major fault at the dividing line between the Allegheny Plateau and the Appalachian Mountains in Williamsport, Pennsylvania The Allegheny Plateau ( / ˌ æ l ɪ ˈ ɡ eɪ n i / AL -ig- AY -nee ) is a large dissected plateau area of the Appalachian Mountains in western and central New York , northern and western Pennsylvania , northern and ...

  8. List of state soil science associations - Wikipedia

    en.wikipedia.org/wiki/List_of_state_soil_science...

    This is a comprehensive list of state-level professional soil science associations in the United States. There is a US Consortium of Soil Science Associations that strives to increase work, communication and corporation between these associations and other soil scientist associations.lun

  9. Soil gradation - Wikipedia

    en.wikipedia.org/wiki/Soil_Gradation

    In soil science, soil gradation is a classification of a coarse-grained soil that ranks the soil based on the different particle sizes contained in the soil. [1] Soil gradation is an important aspect of soil mechanics and geotechnical engineering because it is an indicator of other engineering properties such as compressibility , shear strength ...