Explanation

(a) * exist in different colours 
     * may retain the layers if formed from sedimentary rocks
     * may be jointed

(b) * formed from pre-existing igneous, sedimentary or metamorphic rocks
      * thermal or contact metamorphism-from high temperatures
      * metasomation metamorphism-from chemically active fluids

(c) * source of food nutrients e.g rock salt
     * source of water e.g aquifer
     * source of fertilizer e.g potash

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