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Explanation:

Rocks that forms metamorphic rocks are not pushed to the earth surface. On the surface, the pressure and temperature conditions are not high enough to cause any metamorphic transformation in a rock.

Rocks must subside into deeper levels of the crust where mineral changes occur and hence new rocks called metamorphic rocks.

d. i., ii., iii., and iv.

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.