Final answer:
An intrusion can affect the layers around it through thermal and contact metamorphism, as well as by disrupting original layering.
Step-by-step explanation:
An intrusion is a body of igneous rock that forms when magma cools and solidifies beneath the Earth's surface. The layers around an intrusion can be affected by its presence in a few different ways:
- Thermal metamorphism: The intrusion releases heat as it cools, which can cause the surrounding rocks to be altered or metamorphosed.
- Contact metamorphism: The high temperature of the intrusion can cause the rocks near it to undergo chemical and mineralogical changes.
- Alteration of original layering: The intrusion can disrupt or cut through pre-existing layers, creating new relationships and structures in the surrounding rocks.
Overall, the intrusion can have a significant impact on the layers around it, altering their composition, structure, and mineralogy.