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.
How Fast Does Weathering Occur? Type of Rock Minerals that make up the rock determine how fast it weathers Rocks made of slow dissolving minerals will weather slowly Rocks made of fast dissolving minerals will weather quickly Some rocks weather more easily because they are permeable Climate Refers to the average weather conditions in one area Both chemical & mechanical weathering occur faster in wet climates. Chemical reactions occur faster at higher temperatures. Chemical weathering occurs faster in hot & wet climates Rainfall provides water needed for chemical weathering Definition of Permeable Characteristic of a material that contains connected air spaces or pores that water can seep through easily Spaces increase surface area of the rock Water seeps through, carrying chemicals that dissolve the rock Water also removes material broken down by weathering