Final answer:
The statement that the temperature of intrusive magma has little effect on the metamorphic minerals formed is a False option (2). Temperature has a significant impact on the formation of various metamorphic index minerals and the resulting characteristics of metamorphic rocks.
Step-by-step explanation:
The temperature of the intrusive magma has a significant effect on the metamorphic minerals formed. So the statement that the temperature of the intrusive magma has little effect on the metamorphic minerals formed is False. During metamorphism, heat can cause the recrystallization of minerals and the formation of new minerals.
As rocks are subjected to heat from magmatic intrusions, various index minerals will form at different temperatures, indicating the metamorphic grade of the rock. For instance, chlorite indicates low-grade metamorphism at lower temperatures, while garnet and kyanite indicate medium-grade metamorphism at higher temperatures.
Sillimanite forms at the highest grade before the rock begins to melt into migmatite. The temperature at which a rock metamorphosis will thus play a critical role in determining the mineral assemblage and characteristics of the metamorphic rock.