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ozone layer

n.
1.a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun

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    Idiom of the Day

    come through (for someone)
    to do what one is required or expected to do (often under difficult circumstances)
    My friend will always come through for me when I need his help.



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    My Account / Test History
    Element
    Element : selenium
    Symbol : se
    Atomic no. : 34
    Melting Point (deg c) : 220.5
    Boiling Point (deg c) : 685
    Discoverer : berzelius (1817)      .. More >>
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