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economic geology

n.
1.the branch of geology that deals with economically valuable geological materials

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  • economic geography
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  • economic commission for africa
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  • Idiom of the Day

    back to square one
    to go back to the beginning of something
    The city went back to square one in their effort to build a new bridge.



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    Invention
    Invention : fresnel lens
    Year : 1820
    Inventor : augustin-jean fresnel
    Country : france.      .. More >>
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