smokers' tooth powder
1Cigar ash — is the ash produced by a cigar as it is smoked. Contents 1 Smoking 2 Uses 3 Sherlock Holmes 4 References …
2Cocaine — For other uses, see Cocaine (disambiguation). Cocaine …
3photochemical reaction — Chemical reaction initiated by absorption of energy in the form of visible (light), ultraviolet, or infrared radiation. Primary photochemical processes occur as an immediate result, and secondary processes may follow. The most important example… …
4Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
