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...