The iliac crest is the curved superior border of the ilium, the largest of the three bones that merge to form the os coxa, or hip bone. It is located on the superior and lateral edge of the ilium very close to the surface of the skin in the hip region. When a person places their hands on their hips, it is the skin above the iliac crest that they rest their hands on.
1. Weathering is a term which describes the general process by which rocks are broken down at the Earthâs surface into such things as sediments, clays, soils and substances that are dissolved in water. 2. The process of weathering typically begins when the earthâs crust is uplifted by tectonic forces. After the physical breakup and chemical decay of exposed rocks by weathering, the loosened rock fragments and alterations products are carried away through the process of erosion.
Report Abuse. mechanical or physical weathering is caused by agents of when natural processes which break down rocks or materials into sediments, or small rocks. Mechanical weathering usually only changes the shape and size of a rock. Chemical weathering is caused by changes in a rock's chemical composition.For example, in a limestone cave, when Hydrocloric acid or acid rain comes in contact with the stalagmites and stalacatites, it will break them down.Rusting is another example of chemical weathering. The process is called Oxidation.hemical weathering is caused by changes in a rock's chemical composition. For example, in a limestone cave, when Hydrocloric acid or acid rain comes in contact with the stalagmites and stalacatites, it will break them down. Rusting is another example of chemical weathering. The process is called Oxidation.