Compressional force can cause folding in rocks due to the application of pressure perpendicular to the original layers of rocks. The rocks are subjected to a strong compressional force due to tectonic movements, which leads to deformation and folding of rocks. The compressional force bends the rocks, causing them to fold along the horizontal and vertical axes, forming anticlines and synclines. When the compressional force is applied over a long period, the rocks can undergo significant deformation and folding, resulting in mountain building or orogeny. The type of folds formed depends on the amount of pressure applied, the type of rocks involved, and the temperature and pressure conditions during the deformation process.
