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All metamorphism (in Geological terms) requires heat, whether it is Thermal or Regional:

  • Thermal is heat only. It happens at the surface mainly. This happens upon contact with an igneous intrusion, and in a burnt margin in an extrusion/unconformity like a lava flow.
  • Regional is both heat and pressure. It happens deep beneath the surface only.
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Kyla Klocko

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3y ago

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