Which must be true for metamorphism to occur?

A. The parent rock must be in liquid form.

B. The parent rock must be igneous.

C. The process must take place underground.

D. The grain size must become smaller.

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Which must be true for metamorphism to occur?A. The parent rock must be in liquid form.B. The parent rock must be igneous.C. The process must take place underground.D. The grain size must become smaller.

Which must be true for metamorphism to occur?

A. The parent rock must be in liquid form.

B. The parent rock must be igneous.

C. The process must take place underground.

D. The grain size must become smaller.