ROCKS ARE BURIED TREASURE-They are full of valuable minerals and contain metals, gemstones,fossils and even fuels like coal and petroleum.Every type of rock contains different minerals.There are about 4,000 minerals found on Earth.They have their own unique shape and color. Broadly rocks are of three types- Igneous &nbs p; rocks - These are&nbs p; formed when molten lava comes out of a volcano. When it cools , it crystallizes into solid rock. Sedimentary Rocks - These are made from loose rocks and ancient remains of animals and plants carried by wind and water,they compact and hardened into solid rock over millions of years.Most fossils are found in sedimentary rocks. Metamorphic rocks These rocks are formed when Igneous and sedimentary rocks come under heat and pressure.Then these rocks change their