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  2. Academic grading in the United States - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_the...

    Additionally, many schools add .33 for a plus (+) grade and subtract .33 for a minus (−) grade. Thus, a B+ yields a 3.33 whereas an A− yields a 3.67. [ 18 ] A-plusses, if given, are usually assigned a value of 4.0 (equivalent to an A) due to the common assumption that a 4.00 is the best possible grade-point average, although 4.33 is awarded ...

  3. History of Earth - Wikipedia

    en.wikipedia.org/wiki/History_of_Earth

    The natural history of Earth concerns the development of planet Earth from its formation to the present day. [ 1 ] [ 2 ] Nearly all branches of natural science have contributed to understanding of the main events of Earth's past, characterized by constant geological change and biological evolution .

  4. Grading systems by country - Wikipedia

    en.wikipedia.org/wiki/Grading_systems_by_country

    Grades like Good (3.50) or Excellent (5.75) are common. Any passing grade at or above the .50 mark is prefixed with the term of the next higher grade. The lowest grade is 2.00; grades below 3.00 are failing grades, and the highest is 6.00.

  5. Timeline of natural history - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_natural_history

    The Ca-Al-rich inclusions, which formed 2 million years before the chondrules, [1] are a key signature of a supernova explosion. c. 4,567 ±3 Ma – Rapid collapse of hydrogen molecular cloud , forming a third-generation Population I star , the Sun , in a region of the Galactic Habitable Zone (GHZ), about 25,000 light years from the center of ...

  6. Educational stage - Wikipedia

    en.wikipedia.org/wiki/Educational_stage

    Key Stage 3 6th grade 12–13 Year 8 Second form 7th grade 13–14 Year 9 Third form 8th grade High school Senior high school; 14–15 Year 10 Fourth form Key Stage 4, GCSE: 9th grade Freshman year 15–16 Year 11 Fifth form 10th grade Sophomore year Sixth form / FE College [26] 16–17 Year 12 Lower sixth (AS) Key Stage 5, A level: 11th grade ...

  7. History of cartography - Wikipedia

    en.wikipedia.org/wiki/History_of_cartography

    The inhabited part of his world was circular, disk-shaped, and presumably located on the upper surface of the cylinder. [17]: 24 For constructing his world map, Anaximander is considered by many to be the first mapmaker. [22]: 23 Little is known about the map, which has not survived.

  8. AP United States History - Wikipedia

    en.wikipedia.org/wiki/AP_United_States_History

    The multiple choice questions cover American history from just before European contact with Native Americans to the present day. Questions are presented in sets of two to five questions organized around a primary source or an image (including, but not limited to, maps and political cartoons). Section I part B includes three short-answer questions.

  9. Geological history of Earth - Wikipedia

    en.wikipedia.org/wiki/Geological_history_of_Earth

    The remainder was the world-ocean known as Panthalassa ("all the sea"). All the deep-ocean sediments laid down during the Triassic have disappeared through subduction of oceanic plates; thus, very little is known of the Triassic open ocean. The supercontinent Pangaea was rifting during the Triassic—especially late in the period—but had not ...

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