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ACROSS
1)  air pollution by a mixture of smoke and fog
2)  (anatomy) a somewhat rounded subdivision of a bodily organ or part
3)  (physics and chemistry) the smallest component of an element having the chemical properties of the element
4)  a unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated


DOWN
1)  the scum formed by oxidation at the surface of molten metals
2)  (nontechnical usage) a tiny piece of anything
3)  a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece
4)  art highly prized for its beauty or perfection

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smog
lobe
atom
gees