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单词 sial
释义

Definition of sial in English:

sial

noun ˈsʌɪəlˈsaɪæl
mass nounGeology dated
  • The material of the upper or continental part of the earth's crust, characterized as relatively light and rich in silica and alumina.

    Contrasted with sima
    Example sentencesExamples
    • A mnemonic term derived from for silica, for alumina, and for magnesium, applied as a compositional term to a layer within the Earth that occupies a position intermediate between sial and sima.
    • The rocks found in the crust of the continents is called sial.

Origin

1920s: from the initial letters of silica and alumina.

 
 

Definition of sial in US English:

sial

nounˈsaɪælˈsīal
Geology dated
  • The material of the upper or continental part of the earth's crust, characterized as being of relatively low density and rich in silica and alumina.

    Contrasted with sima
    Example sentencesExamples
    • The rocks found in the crust of the continents is called sial.
    • A mnemonic term derived from for silica, for alumina, and for magnesium, applied as a compositional term to a layer within the Earth that occupies a position intermediate between sial and sima.

Origin

1920s: from the initial letters of silica and alumina.

 
 
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更新时间:2024/9/21 6:04:44