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This is "Rockhead" the rockman. He lives in a volcano and is technically just magma. Magma is melting rock inside a volcano.
Rockhead is erupted, due to extreme heat and pressure, as an extrusive igneous rock. That means that he comes to the Earths surface. Because of this he cools very quickly and forms small crystals. The slower a rock cools the bigger the crystal are.
Rockhead is sitting in the bed of a river and due to mechanical weathering and erosion he is breaking down into little particles called sediments. But don't worry, compaction and cementation turn him into another kind of rock called sedimentary.
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