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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.
Metamorphic rocks were originally igneous or sedimentary, but due to movement of the earth's crust, were changed. Metamorphic rocks are rocks that have been transformed by great heat or pressure. Marble is an example of a sedimentary rock that has been changed into a metamorphic rock. If you squeeze your hands together very hard, you will feel heat and pressure.