Intrusive igneous rocks form beneath the Earth’s surface. They are created from the cooling and solidification of magma that rises from the mantle and becomes trapped in the crust. Because this process occurs underground, intrusive igneous rocks cool slowly, allowing larger crystals to form. Common examples of intrusive igneous rocks include granite and diorite.
The environment in which these rocks form is typically found in areas with tectonic activity, such as at convergent plate boundaries or in continental crust where magma can accumulate. Over time, geological processes, such as erosion, may expose these rocks at the surface, revealing their unique textures and mineral compositions.