Never again? Silica shell and additive may solve the massive clean-up problem posed by last March's Exxon Valdez spill.
Tepati, sacrifical knife, silica inlaid with shell. Aztec civilisation, 14th-16th century. Mexico City, Museo Del Templo Mayor
diatoms; navicula, 250x at 35mm. phylum bacillariophyta (diatoms). unicellar. shell contains silica. - silica shell 個照片及圖片檔