Metamorphic grade refers to which of the following? Select the one best answer.

Question

BlackTom AI · Accepted Answer

To tackle this question, I’ll evaluate what metamorphic grade means and then test each option against that definition.
Option 1: 'the geographic location of the rock' — Metamorphic grade is not about where the rock is found on a map. Location tells us about geography, not the intensity of metamorphism, so this is not a valid descriptor of metamorphic grade.
Option 2: 'how good the rock is for use as a building material, such as a roofing tile' — Building suitability is a practical property related to strength, durability, and aesthetics, but metamorphic grade specifically describes the degree of metamorphism, not commercial applicability. This makes the option incorrect.
Option 3: 'the chemical composition of the rock' — While mineralogy and chemistry change with metamorphism, metamorphic grade is not defined strictly by chemical composition alone; it’s about the degree of metamorphism indicated by textures and index minerals formed at certain pressure–temperature conditions. So this option is misleading and incorrect as a definition of grade.
Option 4: 'the color of the metamorphic rock' — Color can vary due to mineral content and other factors, but grade relies on the intensity of metamorphic conditions and the resulting mineral assemblages, not just color. Therefore, this choice does not capture the concept of metamorphic grade.
Option 5: 'the magnitude of the change in pressure and/or temperature the rock experienced' — This precisely describes metamorphic grade: it reflects how intensely the rock was metamorphosed, i.e., the degree of pressure and temperature change it underwent, which governs mineral reactions and textural changes. This aligns with standard definitions in metamorphic petrology.
Using these evaluations, the only option that aligns with the accepted definition of metamorphic grade is the one describing the magnitude of pressure and/or temperature change the rock experienced. The other choices relate to ancillary properties or misconceptions rather than the formal notion of grade.

Metamorphic grade refers to which of the following? Select the one best answer.单项选择题

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