摇滚如何形式:火岩,沉积岩,变质岩石

为什么学习岩石?- 许多人,很多用途!– writing tools (chalk, pencils), building materials (marble, concrete), fuels (coal), scouring powder (pumice, sand), weapons (flint, obsidian) Rock: a group of minerals bound together – Found in the Earth’s crust and mantle The Rock Cycle: the continuous process of rock formation and change – Presents a “map” of the…