draw a labbled diagramof Rock cycle
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Rock Cycle Diagram
Rocks are broadly classified into three groups: igneous, sedimentary and metamorphic, and the simplest diagram of the "rock cycle" puts these three groups in a circle with arrows pointing from "igneous" to "sedimentary," from "sedimentary" to "metamorphic," and from "metamorphic" to "igneous" again. There is some sort of truth there: for the most part, igneous rocks break down at the Earth's surface to sediment, which in turn becomes sedimentary rocks. And for the most part, the return path from sedimentary rocks back to igneous rocks goes through metamorphic rocks.
But that's too simple. First, the diagram needs more arrows. Igneous rock can be metamorphosed directly into metamorphic rock, and metamorphic rock can turn directly to sediment. Some diagrams simply draw arrows between each pair, both around the circle and across it. Beware of that! Sedimentary rocks cannot melt directly into magma without being metamorphosed along the way. (The minor exceptions include shock melting from cosmic impacts, melting by lightning strikes to produce fulgurites, and friction melting to produce pseudotachylites.) So a fully symmetrical "rock cycle" that connects all three rock types equally is false.
Second, a rock belonging to any of the three rock types can stay where it is and not move around the cycle at all for a long time. Sedimentary rocks can be recycled through sediment again and again. Metamorphic rocks can go up and down in metamorphic grade as they