1. Sills: When metamorphism or accumulation of magma found in the internal part of earth occurs horizontally between sedimentary rocks, then this accumulation of solidified magma in the form of layers is called Sills. This accumulation of sills is found in thick form.
2. Dykes: In the internal part of earth, the vertical accumulation of magma in the rocks or in their walls is called Dykes. This accumulation of Dykes is found in long and thin form. This is an internal form of igneous rock like a wall. The organization of Dykes is somewhere hard and somewhere soft.
