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Geodes are formed in empty spaces inside rocks. Fluids containing minerals make their way into a rock’s cavity and crystals begin to grow. From the outside they look like an ordinary rock, although they are usually round or oval and have a hard, bumpy texture. Investigate whether rocks containing geodes can be determined from the outside.
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Mira un ejemplo de lo que te pierdes
Fecha publicación: 12.5.2016
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