Our planet is a rock manufacturer. We think of rocks as solid & unchanging, yet rocks are in a perpetual cycle of transformation. Most of the processes are moving very slowly & can take centuries to evolve. Igneous rock pushes up from our earth’s core through volcanic activity. The rock arrives at our planet’s surface & is then worn by the weather & becomes sedimentary rock. This rock is slowly pushed back down into the crust & eventually becomes metamorphic rock & the cycle begins again.