Metamorphic rocks are rocks that have changed by:

Question

BlackTom AI · Accepted Answer

The provided data for this question is incomplete: there are no answer options listed to analyze. Typically, a question about metamorphic rocks asks what processes cause them to change, and answer choices would reference factors such as heat, pressure, and chemically active fluids.

In the absence of explicit options to evaluate, here is the foundational idea: metamorphic rocks form when existing rocks are transformed by conditions of elevated temperature and pressure, and often in the presence of chemically active fluids. This leads to recrystallization, new mineral growth, and textural changes without the rock melting. Hence, if the original options included combinations of these factors (for example, heat and pressure; or pressure and fluids; or all of the above), the correct choice would typically reflect that metamorphism requires one or more of these conditions meeting certain thresholds.

Since options are missing, we cannot definitively determine which choice is correct in this exact question. If the intended correct answer is "both (a) and (b)" as you indicated, that would imply there were two factors described in options (a) and (b) that together account for metamorphic change; in standard metamorphism teaching, a comprehensive correct statement often includes heat, pressure, and fluids, rather than just one factor.

For future clarification, please provide the missing answer options, and I can walk through each one in detail, explaining why each is correct or incorrect based on metamorphic rock arguments.

Metamorphic rocks are rocks that have changed by:单项选择题

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