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Which rock has the highest metamorphic grade? rock formed at 500??C and 8 kilobars of pressure rock formed at 1,200??C and 20 kilobars of pressure rock formed at 400??C and 12 kilobars of pressure rock formed at 700??C and 10 kilobars of pressure

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The ansswer is C  i took the test

Answer:

The rock with the highest metamorphic grade would be the one that is formed at '1,200 °C' and '20 kilobars of pressure'.

Explanation:

  • When it comes to the metamorphic grade of rock, it is clear that higher the heat and pressure the rock is subjected to, higher would be its metamorphic grade.
  • Rocks with a high metamorphic grade are comparatively easy to identify because such rocks exhibit foliated surface. Gneiss is a "metamorphic rock" with the "highest metamorphic grade".

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