Sedimentary, igneous, metamorphic. Sedimentary rocks are formed in layers like the earth in lakes, oceans and even ponds. Lava shoots out of volcanos like a chick hatching out of an egg. Then the lava hardens and becomes igneous rock. It's like a tiny cycle, so interesting and magnificent.
Metamorphic rocks can change with heat and pressure.
No matter what kind of rock you have, there's a story to what formed them. Go to the Science Poetry Main Menu . Go to the Ward Wide Web .