Our earth. Rock recipes / [presenter Ben Young] ; [narrator Karina Kelly] ; [writer/producer Dick Beilby].
Rocks are complicated collections of mineral particles. Four silicate mineral groups make up 90% of the crustal rocks - mafic minerals, quartzes, feldspars and micas. Rocks come in three basic varieties - igneous, sedimentary and metamorphic. These are the ingredients of the rock cycle.
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