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| Term | Definition |
|---|---|
| metamorphism | alteration of the composition or structure of a rock by heat, pressure, or other natural agency. |
| solid state alterations | a solid-state transformation of pre-existing rock into a new rock that is texturally and/or mineralogically distinct |
| foliated rocks | the parallel arrangement of certain mineral grains that gives the rock a striped appearance |
| non-foliated rocks | Rocks just like marble, quartzite and hornfels. |
| regional metamorphism | metamorphism affecting rocks over an extensive area as a result of the large-scale action of heat and pressure. |
| contact metamorphism | metamorphism due to contact with or proximity to an igneous intrusion |
| hydrothermal metamorphism | takes place when hot, volatile solutions percolate into and react with the protolith, or the original rock. |
| rock cycle | a basic concept in geology that describes transitions through geologic time among the three main rock types: sedimentary, metamorphic, and igneous. |