Only sedimentary and igneous rocks can be metamorphosed.

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The statement to evaluate is: 'Only sedimentary and igneous rocks can be metamorphosed.'

Beginning with the core concept, metamorphism is the process by which existing rocks are transformed in the solid state under heat, pressure, and/or chemically active fluids, and this process is not restricted to any single rock type.

One way to challenge the claim is to consider sedimentary rocks: for example, shale (a sedimentary rock) commonly transforms into slate and then into phyllite or schist under increasing metamorphic conditions. Limestone, another sedimentary rock, can become marble through metamorphism, illustrating how sedimentary origins can be vividly rewritten.

Next, igneous rocks also undergo metamorphism. Granite, under regional metamorphism, can develop into schists and gneisses, changing mineralogy and texture substantially while still remaining solid rocks.

Do not overlook the possibility of metamorphosing rocks that originated from already metamorphosed textures; the key factor is not the original classification but the exposure to elevated temperature, pressure, and fluids that drive mineralogical changes.

A common misconception here is to think metamorphism only affects one kind of rock or only low-grade changes, but in reality, the process can affect sedimentary, igneous, and even previously metamorphosed rocks, depending on the conditions.

Additionally, the mechanism of metamorphism is not dependent on the rock being originally soft or hard, but on whether minerals can recrystallize and reorient under the imposed physical conditions, which applies across rock types.

To summarize (without naming any options), the assertion that metamorphism is limited to sedimentary and igneous rocks misstates the scope of metamorphic processes; rocks of other origins can also experience metamorphism when subjected to appropriate environmental factors.

Geography CC 1 Sec ON1 (31167) Quiz #8: Units 27-29

Only sedimentary and igneous rocks can be metamorphosed.

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