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　(a) desert sand (expanded picture〕　 (b) carbonated water with Fe and Si2O
　
　　　　　　　　
(c) H2O + CO2 + Fe + Si2O + CaCO3 (ｄ) upper part of glass container off water
Fig.32　The reaction that occurs in the carbonated water. Here, powder of iron, desert sand and fossil were put in the carbonated water.



6.2　The iron carbide bubble that adheres to a glass wall
　6.2.a　Trace of the bubble that adheres to a glass wall
　The bubble is produced repeatedly at the same place of a glass wall. So, the concentric circle of traces that adhere to a transparent part of glass is observed. When the container vibrates, a part of bubble that adhered to glass is fixed, but the other parts are moved with water. Those traces are shown in Fig.33.

　
Fig. 33　The substance that adhered to a glass wall (the photographing is after 10 hours 27 minutes from the mixing, iron powder and CaCO3 were mixed with carbonated water)



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