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  2. AP World History: Modern - Wikipedia

    en.wikipedia.org/wiki/AP_World_History:_Modern

    AP World History: Modern was designed to help students develop a greater understanding of the evolution of global processes and contacts as well as interactions between different human societies. The course advances understanding through a combination of selective factual knowledge and appropriate analytical skills.

  3. Ring system - Wikipedia

    en.wikipedia.org/wiki/Ring_system

    Artist's depiction of Haumea's ring system. A ring around Haumea, a dwarf planet and resonant Kuiper belt member, was revealed by a stellar occultation observed on 21 January 2017. This makes it the first trans-Neptunian object found to have a ring system. [32] [33] The ring has a radius of about 2,287 km, a width of ≈ 70 km and an opacity of ...

  4. Symbols and conventions used in welding documentation

    en.wikipedia.org/wiki/Symbols_and_conventions...

    One such symbol is a circle to indicate an all-around weld, which goes on every side of the joint. Finish symbols go above the reference line to indicate the surface contour or finish of the weld such as flush, convex or concave. Letters indicating the welding process are placed at the tail end, such as AHW for atomic hydrogen welding. Further ...

  5. Earth ring theory may shed light on an unexplained ancient ...

    www.aol.com/earth-may-had-saturn-ring-115417013.html

    It could help answer the mysteries of Earth’s history as well as pose new questions about the influence an ancient ring could have had on evolutionary development, Tomkins said. A Saturn-like ...

  6. Rings of Earth - Wikipedia

    en.wikipedia.org/wiki/Rings_of_Earth

    The ring was first formally proposed after 21 impact craters from the meteor event were found to be located along a straight band around the Earth's equator. [10] [11] Andrew G. Tomkins, [9] Erin L. Martin [9] and Peter A. Cawood, [9] working with Monash University, released a study in September 2024 that gave evidence on the existence of the ...

  7. World-systems theory - Wikipedia

    en.wikipedia.org/wiki/World-systems_theory

    World-systems theory (also known as world-systems analysis or the world-systems perspective) [3] is a multidisciplinary approach to world history and social change which emphasizes the world-system (and not nation states) as the primary (but not exclusive) unit of social analysis. [3]

  8. Warden's Five Rings - Wikipedia

    en.wikipedia.org/wiki/Warden's_Five_Rings

    The Five Rings include: Leadership; Organic/System Essentials/Key Production; Infrastructure; Population; Fielded Military Forces; Each level of system or "ring" was considered one of the enemy's centers of gravity. The idea behind Warden's five rings was to attack each of the rings to paralyze their forces, an objective also known as physical ...

  9. Ring dike - Wikipedia

    en.wikipedia.org/wiki/Ring_dike

    The Pilanesberg Ring Dike Complex in South Africa. A ring dike or ring dyke is an intrusive igneous body that is circular, oval or arcuate in plan and has steep contacts. [1] While the widths of ring dikes differ, they can be up to several thousand meters. [2] The most commonly accepted method of ring dike formation is directly related to ...