1. Weathering and Erosion: Igneous rocks, like any other rock type, can be broken down by weathering (physical and chemical processes like wind, rain, ice, and chemical reactions). This creates smaller pieces of rock, sediment, which can then be transported away by erosion (forces like wind and water).

2. Metamorphism: If an igneous rock is buried deep within the Earth's crust and subjected to intense heat and pressure, it can transform into a metamorphic rock. This process changes the rock's mineral composition, texture, and possibly even its overall structure.