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  2. Cross-bedding - Wikipedia

    en.wikipedia.org/wiki/Cross-bedding

    Cross-beds are angled relative to either the base or the top of the surrounding beds. As opposed to angled beds, cross-beds are deposited at an angle rather than deposited horizontally and deformed later on. [8] Trough cross-beds have lower surfaces which are curved or scoop shaped and truncate the underlying beds.

  3. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [ 4 ] As of December 2021, Quizlet has over 500 million user-generated flashcard sets and more than 60 million active users.

  4. Bed (geology) - Wikipedia

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

    Types of beds include cross-beds and graded beds. Cross-beds, or "sets," are not layered horizontally and are formed by a combination of local deposition on the inclined surfaces of ripples or dunes, and local erosion. Graded beds show a gradual change in grain or clast sizes from one side of the bed to the other. A normal grading occurs where ...

  5. Quiz bowl - Wikipedia

    en.wikipedia.org/wiki/Quiz_bowl

    Most forms of modern quiz bowl are modeled after game shows. [4] College Bowl, which was created by Don Reid as a USO activity for U.S. servicemen during World War II, was an influential early quiz bowl program. [5] [6] Also known as "The College Quiz Bowl," it started on radio in 1953 and then aired on national television in the U.S. from 1959 ...

  6. Mathematical game - Wikipedia

    en.wikipedia.org/wiki/Mathematical_game

    A mathematical game is a game whose rules, strategies, and outcomes are defined by clear mathematical parameters. [1] [verification needed] [clarification needed] Often, such games have simple rules and match procedures, such as tic-tac-toe and dots and boxes. Generally, mathematical games need not be conceptually intricate to involve deeper ...

  7. Herringbone cross-stratification - Wikipedia

    en.wikipedia.org/wiki/Herringbone_cross...

    During the conventional formation process of cross-stratification, sand grains saltate up the upstream side of the dune, collecting at the peak until the angle of repose is reached. At this point, the crest of granular material has grown too large and will be overcome by the force of the depositing fluid, falling down the downstream side of the ...

  8. Foreset bed - Wikipedia

    en.wikipedia.org/wiki/Foreset_bed

    A cross-section of a delta shows the cross bedding in the direction of stream flow into the still water. The foreset bed is formed when a stream carrying sediment meets still water. When the stream meets the still water, the velocity of the water is decreased enough so that the larger sediment particles can no longer be carried and are ...

  9. Mathematical model - Wikipedia

    en.wikipedia.org/wiki/Mathematical_model

    The variables represent some properties of the system, for example, the measured system outputs often in the form of signals, timing data, counters, and event occurrence. The actual model is the set of functions that describe the relations between the different variables.