Final answer:
True, in contact metamorphism, the rocks closest to the igneous intrusion experience the most intense metamorphism due to the higher temperatures leading to more significant changes like recrystallization and foliation.
Step-by-step explanation:
In contact metamorphism, the concept that the closest rock to the igneous intrusion would experience the most intense metamorphism is indeed true. The reason for this is because heat and temperature are critical factors in the process of metamorphism. As you get closer to the source of heat, which in this case is the igneous intrusion, the temperature increases, leading to more intense changes in the rock.
This is highlighted in the understanding of metamorphic rocks, which form when pre-existing rocks, known as protoliths, are altered by changes in temperature and pressure. These factors can cause changes such as the recrystallization of minerals, the development of new minerals, and the re-orientation of existing minerals to create a foliated texture.