Final answer:
Geologists track the distribution of different grades of metamorphic rock by analyzing various characteristics of the rocks, such as foliation, grain size, mineralogy, and hardness.
Step-by-step explanation:
Geologists track the distribution of different grades of metamorphic rock by analyzing various characteristics of the rocks, such as foliation, grain size, mineralogy, and hardness.
They use these features to distinguish between different grades of metamorphism and create maps that show the distribution of these rocks. By studying the patterns and locations of different grades of metamorphic rocks, geologists can gain insights into the geological processes and history of an area.