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This sand is from the Big Sur coast of California, with many metamorphic rocks created near an ancient subduction zone. The sand on the right is 100% composed on shells, coral skeleton, and other biological precipitates.
You may want to have several sample s of metamorphic rocks and the rocks. they changed from. A gneiss could have come from a granite (igneous). Shale. (sedimentary) could have become slate. Slate (metamorphic) if put under more. pressure could change into a schist. A basalt (igneous) could also become a schist. Limestone (sedimentary) can become marble. Lesson 1 - Formation of Metamorphic Rocks.