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Cerium

Cerium is a soft, ductile, silvery-white metallic chemical element with symbol Ce and atomic number 58. It tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. It is the se ...

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Equipo Didactalia

River

Piedra (Spain)

The Piedra (Spanish: Río Piedra) is a river in the Iberian System area, Spain. It is a tributary of the river Jalón. The waters have a high concentration of calcium carbonate which is deposited on pla ...