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Pyroclastic vs Null - What's the difference?

pyroclastic | null |

As nouns the difference between pyroclastic and null

is that pyroclastic is a rock mostly composed of rock fragments of volcanic origin while null is zero, nil; the cardinal number before einn.

As an adjective pyroclastic

is (vulcanology) mostly composed of rock fragments of volcanic origin or comminuted during an eruption.

pyroclastic

English

Adjective

(-)
  • (vulcanology) Mostly composed of rock fragments of volcanic origin or comminuted during an eruption.
  • *{{quote-book
    • , year= 1862 , year_published= , author= , by= , title= The Student's Manual of Geology , url= http://books.google.com/books?id=3DUDAAAAQAAJ&pg=PA68 , original= , chapter= Igneous Rocks , isbn= , edition= 2 , publisher= Adam and Charles Black , location= Edinburgh , editor= , volume= , page= 68 , passage= The word "ash" is not a very good one to include all the mechanical accompaniments of a subaerial or subaqueous eruption, since ash seems to be restricted to a fine powder, the residuum of combustion. A word is wanting to express all such accompaniments, no matter what their size or condition may be, when they are accumulated in such mass as to form beds of "rock." We might call them perhaps "pyroclastic materials," ... }}

    Derived terms

    * pyroclastic flow * pyroclastic rock * pyroclastic surge

    Noun

    (en noun)
  • A rock mostly composed of rock fragments of volcanic origin
  • *{{quote-book
    • , year= 1897 , year_published= , author= , by= , title= The American Naturalist: An Illustrated Magazine of Natural History , url= http://books.google.com/books?id=lnIWAAAAYAAJ&pg=PA221 , original= , chapter= General Notes: Geology and Paleontology , section = No. 363 , isbn= , edition= , publisher= The Edwards & Docker Co. , location= Philadelphia , editor= Edward D. Cope and Frederick C. Kenyon , volume= 31 , page= 221 , passage= The basic volcanics are altered andesites, porphyritic diabases and andesites, and various pyroclastics . }}

    null

    English

    Noun

    (en noun)
  • A non-existent or empty value or set of values.
  • Zero]] quantity of [[expression, expressions; nothing.
    • (Francis Bacon)
  • Something that has no force or meaning.
  • (computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.
  • (computing) the attribute of an entity that has no valid value.
    • Since no date of birth was entered for the patient, his age is null .
  • One of the beads in nulled work.
  • (statistics) null hypothesis

    • Adjective

    (en adjective)
  • Having no validity, "null and void"
  • insignificant
  • * 1924 , Marcel Proust, Within a Budding Grove :
    • In proportion as we descend the social scale our snobbishness fastens on to mere nothings which are perhaps no more null than the distinctions observed by the aristocracy, but, being more obscure, more peculiar to the individual, take us more by surprise.
  • absent or non-existent
  • (mathematics) of the null set
  • (mathematics) of or comprising a value of precisely zero
  • (genetics, of a mutation) causing a complete loss of gene function, amorphic.

    • Derived terms

    * nullity

    Verb

    (en verb)
  • to nullify; to annul
    • (Milton)

    Related terms

    * annul

    See also

    * nil ----