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.
artery - a blood vessel that carries blood from the heart to the body. arteria, arterial blood vessel. alveolar artery, arteria alveolaris - a branch of the maxillary artery that supplies the alveolar process. angular artery, arteria angularis - the terminal branch of the facial artery.