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  1. A fine-grained metamorphic rock with a foliation caused by the preferred orientation of very fine-grained mica.
  2. Conglomerate that has undergone metamorphism, but in which clasts are still recognizable; typically the clasts are stretched or flattened.
  3. A mineral formed by solid-state transitions under metamorphic conditions.
  4. Metamorphism that occurs as a consequence of shearing alone, with no change in temperature or pressure.
  5. An older, interior region of a continent.
  6. The original rock from which a metamorphic rock formed.
  7. Metamorphism of a broad region, usually the result of deep burial during an orogeny.
  8. The region around a pluton, stretching tens to hundreds of meters out, in which heat transferred into the country rock and metamorphosed the country rock.
  9. A compositionally banded metamorphic rock typically composed of alternating dark- and light-colored layers.
  10. Rock that undergoes metamorphism simply because of a change in temperature, without being subjected to differential stress.
  11. A fabric defined by parallel surfaces or layers that develop in a rock as a result of metamorphism; schistocity and gneissic layering are examples.
  12. Solid-state changes in rock that result from the extreme pressure accompanying a meteorite impact.
  13. Metamorphism caused by heat conducted into country rock from an igneous intrusion.
  14. Metamorphism due to the increase in temperature and pressure in a rock when it has been buried to a depth of several kilometers.
  15. A medium- to coarse-grained metamorphic rock that possesses schistosity.
  16. A metamorphic rock composed of calcite and transformed from a protolith of limestone.
  17. The process by which a rocks overall chemical composition changes during metamorphism because of reactions with hot water that bring in or remove elements.
  18. The arrangement of grains (e.g., preferred orientation) formed as a result of metamorphism.
  19. Metamorphism caused by heat conducted into country rock from an igneous intrusion.
  20. A metamorphic rock composed of quartz and transformed from a protolith of quartz sandstone.
  21. A set of metamorphic mineral assemblages indicative of metamorphism under a specific range of pressures and temperatures.
  22. Rock that forms when preexisting rock changes into new rock as a result of an increase in pressure and temperature and/or shearing under elevated temperatures; metamorphism occurs without the rock first becoming a melt or a sediment.
  23. Fine-grained, low-grade metamorphic rock, formed by the metamorphism of shale.
  24. The region between two metamorphic isograds, typically named after an index mineral found within the region.
  25. Layering formed as a consequence of the alignment of mineral grains, or of compositional banding in a metamorphic rock.
  26. The process by which one kind of rock transforms into a different kind of rock.
  27. The process (involving uplift and erosion) that returns deeply buried rocks to the surface.
  28. The change that occurs in a rock due to interaction with high-temperature water solutions.
  29. An informal designation of the degree to which a rock has undergone metamorphism; high-grade rocks have endured higher temperatures than low-grade rocks.
  30. Metamorphism that involves heat, pressure, and shearing.
  31. The metamorphic texture that exists where platy grains lie parallel to one another and/or elongate grains align in the same direction.
  32. A condition causing a material to experience a push or pull in one direction of a greater magnitude than the push or pull in another direction; in some cases, differential stress can result in shearing.