Most marine animals form their shells from calcium carbonate, which is a tough mineral also found in limestone. Some sponges and microorganisms use another compound silica. There is also a group of ...
MetDaan on MSN
Egg shell art: Creative craft for kids
Egg Shell Art: Creative Craft for Kids!!
ArttSmartt on MSN
Sea shell coloring in for kids
Sea Shell coloring in for Kids!!
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