(ËÊÉÊldÉ) n. 1. (Anatomy) the part of the vertebrate body where the arm or a corresponding forelimb joins the trunk: the pectoral girdle and associated structures. 2. (Anatomy) the joint at the junction of the forelimb with the pectoral girdle.
â¢ Erosion and deposition are continuous geological processes that are natural and result in relief features seen over the surface of the earth. â¢ If erosion is seen as a sequence of events, deposition takes place at last when the rock particles finally settle down on the surface of earth.
Two different types of succession, primary and secondary, have been distinguished. Primary succession occurs in essentially lifeless areasâregions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. Secondary succession occurs in areas where a community that previously existed has...