Answer:
It's a rock that has likely undergone metamorphism
Step-by-step explanation:
A rock with individual black and white crystals that is found in an area that once had an active volcano and has since been affected by erosion is likely to be a rock that has undergone the process of metamorphism.
Metamorphism is the process by which rocks are changed by heat, pressure, and chemical processes, often as a result of the movement of tectonic plates. When a rock undergoes metamorphism, the minerals that make up the rock can be rearranged and recrystallized into new forms, often resulting in the formation of visible crystals.
The presence of individual black and white crystals in the rock is a characteristic of metamorphic rocks. These crystals are likely to be formed from different minerals that were present in the original rock before it underwent metamorphism.
The fact that the rock was found in an area that once had an active volcano and has since been affected by erosion suggests that it has been exposed to intense heat and pressure, which are typical conditions for metamorphism to occur.
A rock with individual black and white crystals that is found in an area that once had an active volcano and has since been affected by erosion is likely to be a metamorphic rock.