The rock cycle is a huge part of how rocks are formed and changed. Lets start with sediment when sediment is put under extreme pressure, it compacts into a sedimentary rock. then this sedimentary rock can erode and weather and turn back into sediment the rocks on the very very deep in the earth and through heat and pressure change to metamorphic rock. When the metamorphic rock is push up it may turn back into sediment but if he metamorphic rock is buried deeper, it gets hotter and melts. Once it becomes magma it may eventually be pushed up and out of a volcano. The hardened crystalized lava then these new rocks are igneous.
Throughout this process the rocks chemical composition keeps changing, melting morphing, eroding, all off these processes can make the rocks that have gone through this process hard to interpret, and very chemically different then they were say, during the Precambrian. Rocks that haven't gone though this process are rare because it has been so long and they have had many chances to change and the rock cycle will always continue. Just like the lab we did today. rolling the die it is very rare to stay at one station for a very long time. this is what Precambrian rock would have to do to be interpretable.
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