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  2. Five themes of geography - Wikipedia

    en.wikipedia.org/wiki/Five_themes_of_geography

    The five themes were published in 1984 [1] and widely adopted by teachers, textbook publishers, and curriculum designers in the United States. [2] Most American geography and social studies classrooms have adopted the five themes in teaching practices, [3] as they provide "an alternative to the detrimental, but unfortunately persistent, habit ...

  3. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    While primarily associated with natural numbers in arithmetic, subtraction can also represent removing or decreasing physical and abstract quantities using different kinds of objects including negative numbers, fractions, irrational numbers, vectors, decimals, functions, and matrices. [2] In a sense, subtraction is the inverse of addition.

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The transition from activities to the formal Mathematical systems is guided by a variety of general insights and ideas. Another approach for defining mathematics is to use its methods. For example, an area of study is often qualified as mathematics as soon as one can prove theorems—assertions whose validity relies on a proof, that is, a ...

  5. Subtractive drawing - Wikipedia

    en.wikipedia.org/wiki/Subtractive_drawing

    A charcoal portrait of Ethel Grenfell by John Singer Sargent, drawn with a combination of subtractive and additive techniques.. Subtractive drawing is a technique in which the drawing surface is covered with graphite or charcoal marks and then erased to make the image. [1]

  6. Spring (season) - Wikipedia

    en.wikipedia.org/wiki/Spring_(season)

    The spring equinox is in March in the Northern Hemisphere and in September in the Southern Hemisphere, while the summer solstice is in June in the Northern Hemisphere and in December in the Southern Hemisphere. Spring and "springtime" refer to the season, and also to ideas of rebirth, rejuvenation, renewal, resurrection and regrowth.

  7. Season - Wikipedia

    en.wikipedia.org/wiki/Season

    A season is a division of the year [1] based on changes in weather, ecology, and the number of daylight hours in a given region. On Earth, seasons are the result of the axial parallelism of Earth's tilted orbit around the Sun.

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