Submit. Â· just now. Report Abuse. when a rock is subjected to severe heat, then dramatic cooling onion weathering takes place. This is a form of physical weathering. The sudden change of temperature weakens the outer layer of rock and it will crumble away, this happens to rocks in the desert.
Definition. Common arterial trunk (CAT) is characterized by a single arterial trunk that arises from the base of the heart and gives origin to the systemic, coronary and pulmonary circulation. A large ventricular septal defect (VSD) is almost always present.
Definition of trunk for Students. 1 : the thick main stem of a tree not including the branches and roots. 2 : a box or chest for holding clothes or other articles especially for traveling. 3 : the enclosed space in the rear of an automobile for carrying articles.