Unit 5 Essay Example

Unit 5 Paper What is frost wedging ? Mechanical weathering occurs when physical forces break rock into smaller and smaller pieces without changing the rocks mineral composition What is frost wedging ? After many freeze-thaw cycles, the rock breaks into pieces by a process called frost wedging When water freezes, it volume _______. Its volume expands by about 9%, exerting a tremendous outward force. This force is great enough to burst water pipes during the winter Which of the following is NOT associated with mechanical weathering ? Reactions with oxygen What is chemical weathering ? Chemical weathering is the transformation of rock into one or more new compounds Which of the following is the result of chemical weathering ? a rock that has been changed into one or more new compounds The atmospheric gas forms a mild acid when dissolved in water is _______. Carbon dioxide what would cause the inscription on a marble gravestone to become harder and harder to read over time ? Chemical weathering What climate does chemical weather favor the most ? Climates with high temperatures and abundant moisture What are the major components of soil ? a. mineral matter or broken down b. organic matter or humus, which is decayed remains of organisms c. water d. air A soils texture is determined by ______. you use categories of clay, silt, and sand in the soil The main source of organic matter in soil is _______. plants Use figure 5-1 to determine what soil is called if it has 20 percent clay, 60 percent silt, and 20 percent sand. Silty loam What are the proportions of clay, silt, and sand shown at point B in figure 5-1 ? Clay 20%, silt 40%, sand 40% What are the proportions of clay, silt, and sand shown ate point A in figure 5-1 ? Clay 60%, silt 20%, sand 20% What are the proportions of clay, silt, and sand shown at point C in figure 5-1 ? Clay 10%, Silt 20%, sand 70% A soil associated with the hot and wet tropics is _______. laterite Pedalfer soils contains high amounts of _______. Iron oxide and aluminum- rich clays The process responsible for moving material downslope under the influence of gravity is called ________. Mass movement What is the force of gravity behind