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  2. Chalk - Wikipedia

    en.wikipedia.org/wiki/Chalk

    Chalk is so common in Cretaceous marine beds that the Cretaceous Period was named for these deposits. The name Cretaceous was derived from Latin creta, meaning chalk. [10] Some deposits of chalk were formed after the Cretaceous. [11] The Chalk Group is a European stratigraphic unit deposited during the late Cretaceous Period.

  3. Sentence clause structure - Wikipedia

    en.wikipedia.org/wiki/Sentence_clause_structure

    A complex sentence has one or more dependent clauses (also called subordinate clauses). Since a dependent clause cannot stand on its own as a sentence, complex sentences must also have at least one independent clause. In short, a sentence with one or more dependent clauses and at least one independent clause is a complex sentence.

  4. List of alchemical substances - Wikipedia

    en.wikipedia.org/wiki/List_of_alchemical_substances

    The crust formed on the lid was ground to powder and boiled with water to remove the calomel. Calx – calcium oxide; was also used to refer to other metal oxides. Chalcanthum – the residue produced by strongly roasting blue vitriol (copper sulfate); it is composed mostly of cupric oxide. Chalk – a rock composed of porous biogenic calcium ...

  5. Gypsum - Wikipedia

    en.wikipedia.org/wiki/Gypsum

    Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk.

  6. Part of speech - Wikipedia

    en.wikipedia.org/wiki/Part_of_speech

    Works of English grammar generally follow the pattern of the European tradition as described above, except that participles are now usually regarded as forms of verbs rather than as a separate part of speech, and numerals are often conflated with other parts of speech: nouns (cardinal numerals, e.g., "one", and collective numerals, e.g., "dozen ...

  7. English compound - Wikipedia

    en.wikipedia.org/wiki/English_compound

    English inherits the ability to form compounds from its parent the Proto-Indo-European language and expands on it. [2] Close to two-thirds of the words in the Old English poem Beowulf are found to be compounds. [3] Of all the types of word-formation in English, compounding is said to be the most productive. [4]

  8. English prepositions - Wikipedia

    en.wikipedia.org/wiki/English_prepositions

    The Cambridge Grammar of the English Language (CGEL) says of complex prepositions, In the first place, there is a good deal of inconsistency in the traditional account, as reflected in the practice of dictionaries, as to which combinations are analysed as complex prepositions and which as sequences of adverb + preposition.

  9. One-letter word - Wikipedia

    en.wikipedia.org/wiki/One-letter_word

    A one-letter word is a word composed of a single letter. The application of this apparently simple definition is complex, due to the difficulty of defining the notions of word and letter. One-letter words have an uncertain status in language theory, dictionaries and social usage.