martes, 9 de noviembre de 2010

The rock cycle

Rocks are  form of little pieces of  minerals.There are three types of rocks that are igneous rock,metamorphic rock, sedimentary rock.

-sedimentary rock:a rock that forms from pieces of other rock that are squeezed or cemented together

-igneous rock: a rock that forms when hot,liquid rock material cools and hardens into a solid

metamorphic rock:is a rock that forms from another kind of rock that is changed by heat or pressure  or by a chemical reaction



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