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  2. Quaternary sector of the economy - Wikipedia

    en.wikipedia.org/wiki/Quaternary_sector_of_the...

    The quaternary sector of the economy is based upon the economic activity that is associated with either the intellectual or knowledge-based economy. [1] This consists of information technology; media; research and development; information-based services such as information-generation and information-sharing; and knowledge-based services such as consultation, entertainment, broadcasting, mass ...

  3. Quaternary science - Wikipedia

    en.wikipedia.org/wiki/Quaternary_science

    It is a rapidly changing field with new research techniques being developed e.g. new dating techniques. Quaternary science is a field of study which involves geography, biology, chemistry, and physics. [4] Its focus is during the Quaternary Period – a time period that started around 2.58 million years ago and which continues to the present ...

  4. Economic sector - Wikipedia

    en.wikipedia.org/wiki/Economic_sector

    In the 20th century, economists began to suggest that traditional tertiary services could be further distinguished from "quaternary" and quinary service sectors. Economic activity in the hypothetical quaternary sector comprises information- and knowledge-based services, while quinary services include industries related to human services and ...

  5. IB Group 4 subjects - Wikipedia

    en.wikipedia.org/wiki/IB_Group_4_subjects

    The Chemistry, Biology, Physics and Design Technology was last updated for first teaching in September 2014, with syllabus updates (including a decrease in the number of options), a new internal assessment component similar to that of the Group 5 (mathematics) explorations, and "a new concept-based approach" dubbed "the nature of science". A ...

  6. Quaternary (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Quaternary_(chemistry)

    Quaternary is a term used in organic chemistry to classify various types of compounds (e. g. amines and ammonium salts). [1]

  7. Quaternary (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Quaternary_(disambiguation)

    The Quaternary is a geologic period. Quaternary (an adjective meaning "fourth in order" or "composed of four items") may also refer to: Quaternary (chemistry) (see also Quaternary compound and Quaternary phase) Quaternary structure of proteins; Quaternary sector of the economy, which encompasses knowledge-based services

  8. Industry classification - Wikipedia

    en.wikipedia.org/wiki/Industry_classification

    Industry classification or industry taxonomy is a type of economic taxonomy that classifies companies, organizations and traders into industrial groupings based on similar production processes, similar products, or similar behavior in financial markets.

  9. AP Chemistry - Wikipedia

    en.wikipedia.org/wiki/AP_Chemistry

    The 2014 AP Chemistry exam was the first administration of a redesigned test as a result of a redesigning of the AP Chemistry course. The exam format is now different from the previous years, with 60 multiple choice questions (now with only four answer choices per question), 3 long free response questions, and 4 short free response questions.