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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

    do over (something) or do (something) over
    to repeat something, to do something again
    The teacher made me do my homework over.



    1.
    As Ramiro strolled through his old neighborhood, he noticed sounds and smells that were ________ of his childhood.

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