Metamorphic Rocks

Metamorphic rocks are rocks that have changed. The word comes from the Greek root "meta" and "morph" which means to change form. Metamorphic rocks were originally igneous or sedimentary, but due to movement of the earth's crust, were changed. If you squeeze your hands together very hard, you will feel heat and pressure. When the earth's crust moves, it causes rocks to get squeezed so hard that the heat causes the rock to change.  Metamorphic rocks to know: Gneiss Quartzite Schist Marble Slate Making our own metamorphic rock: Before After applying heat and pressure, our metamorphic rock has been formed! k.