WHY ARE ROCKS MADE OF ?

ANSWER :- EVERY TYPE OF ROCK HAS ITS OWN "RECIPE" OF ONE OR MORE MINERALS . THERE ARE ABOUT 4,000 MINERALS FOUND ON EARTH , EACH WITH ITS OWN UNIQUE SHARP AND COLOUR . EARTH'S ROCKS ARE LIKE BURIED TREASURE - THEY ARE FULL OF VALUBLE MINERALS  AND CONTAIN METALS , GEMSTONE , FOSSILS , AND FUELS , SUCH AS COAL AND GAS.