I WONDER - What Is The Most Common Metamorphic Rock?

The video tutorial discusses metamorphic rocks, focusing on slate. Slate is a common metamorphic rock formed from shale, a type of sedimentary rock. The transformation occurs when shale is subjected to heat and pressure, causing clay minerals to recrystallize into slate. Slate is characterized by its fine grain and dull surface, making it suitable for roofing tiles, flooring, and chalkboards.

What new insight or understanding did you gain from this video?