- Himalaya Alps, etc., are found in the cervical block of excessive folding type. The cervical block represents the complex structure on the crust. In fact, Nerva is a French word, which means. Tablecloth / folding folds in which both arms are parallel and horizontal. Due to the excess of compression, one arm breaks on the axes of the fold and moves to another type of rock by horizontal movement, slipping over a distance from its origin. This broken and shifted rock-cut is called cervical. His examples are often found in the great mountains.
Due to the effect of horizontal compressive forces, the surface rocks have convection and folding, but the process of folding is possible only in elastic and soft rocks. Hence most of the folds are found in sedimentary rocks. Due to the pressure in hard rocky rocks, cracks also occur more than folding. This process creates inverse fractures. As a result of folding, the parts that rise above the rocks are adopted and the sunken parts below are called Abhinati. The floor along which the flanking rocks turn. It is called the axis of folding. When a gradient on either side of apnea or inductance makes equal angles with the axis of folding, it is called symmetric folding
it is said. When the angles of these two slopes are uneven, the fold is called an asymmetric fold. If the compressive forces on the rocks from both sides
If they are equal, the folds are symmetric. If compression is high in any one direction, folding is inconsistent. Excessive from one direction
Due to compression many times one arm of the folds climbs over the other arm and the folds become horizontal. This process is called overloading. Sometimes the arms of the folds are broken due to horizontal movement and compression and a broken arm move away from its place. This type of relocated land field is called cervical or nape.