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In short, the rock cycle is the name for the processes that forms and recycles the different types or rocks on our planet. Rocks begin the cycle as igneous rocks, erode into sedimentary rocks then change into metamorphic rocks, finally the rocks melt back to magma and start the process again.
Lecture 15 - Igneous and metamorphic rocks. Lisa Tauxe. In the last lecture, we zoomed in on the weathering/sedimentation part of the rock cycle. Today, we will consider what happens when stuff goes down the tubes, gets metamorphosed and ultimately gets remelted and comes up as igneous rocks once again.