Note to moderator: Read answerline carefully. Description acceptable. Indicators of this property include titanium content and chlorite crystallinity. To study cycles where this property increases, peaks, then decreases, scientists combine data from GBs and GARBs to reconstruct looped P-T-t paths. Points with the same value for this property are joined by isograds. This property increases moving toward the top right in charts on P-T diagrams, such as during the transition from greenschist to granulite facies in the Barrovian series. Index minerals gauge this property, which is low in samples formed through a related process’s “burial” and “contact” forms. This property increases as shale protolith develops into slate, phyllite (“FILL-ite”), schist (“shist”), and gneiss (“nice”). For 10 points, name or describe this property that indicates how much rocks have transformed following exposure to heat and pressure. ■END■
ANSWER: metamorphic grade [accept low grade or medium grade or high grade; accept prograde or retrograde or pre-peak or peak or post-peak metamorphism; accept descriptions indicating the amount or degree or intensity or extent or rank of metamorphism; accept descriptions indicating how metamorphosed or metamorphic a rock is; reject “metamorphism” alone; reject “metamorphosis”]
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= Average correct buzz position