- Why are man-made diamonds not minerals?

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I want to login again? If a and b are positive integers such that gcd(a,b)=210, lcm[a,b]=210^3, and a** **If Earths atmosphere was 20 percent as thick as now how big would the temperature swings be? Pb(NO3)2 + KI ->? What should be added to equation to make it a perfect square 9x^4 + 2x^2 + 25? ....Please!?