GPHY 102 Lecture Notes - Lecture 15: Denudation, Walkover, Mass Wasting
15 Oct 2014
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As denudation progresses, landscape features develop according to patterns of bedrock composition and structure. Under similar climatic and topographic conditions, rock denudation rates are generally related to rock type (fastest for sedimentary rock, and is progressively slower for metamorphic and igneous types). Denudation rates are related to rock hardness, but other lithological factors, such as fracturing, jointing, and permeability are also important. Weathering (cid:149) the physical or chemical alteration of rock, usually involving disintegration to smaller elements. (iii) biological (cid:149) not mutually exclusive. (cid:149) weathering (rock) versus erosion (denudation (and movement) of earth materials ) In physical weathering, rocks are fractured and broken apart without chemical alteration due to processes such as frost action expansion and contraction caused by changes in temperature. Physical weathering (cid:149) also known as mechanical weathering. (cid:149) causes the disintegration of rocks without chemical change to minerals. (cid:149) caused by external disruptive forces (e. g. growth of ice in rock joints).
