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.
Physical weathering does not produce any change in the chemical composition of the rock rather the rock becomes broken up into fragments smaller than the initial volume of rock. Chemical weathering, on the other hand, are chemical changes undergone by rocks exposed near the earthâs surface.Rocks typically form in pressure and temperature conditions far removed from those at or near the earthâs surface.eathering Weathering is the process of breakdown of rocks at the surface of the earth and reflects an adjustment of rocks to conditions of temperature, humidity and fluid composition on the earthâs surface.