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<br />13 <br /> <br />. <br /> <br />. <br /> <br /> <br />(\ <br /> <br />~- <br /> <br />. <br /> <br />--- <br /> <br />-"" <br /> <br />. <br /> <br />..... <br /> <br />... <br /> <br />". <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />-- ---" Ir <br /> <br />..._......~ <br /> <br />. <br /> <br />Figure 2. Rivers flow through a series of stages. They <br />flow swiftly in V-shaped valleys at their <br />headwaters, and then meander slowly across <br />U-shaped valleys at maturity (12:84). <br /> <br />. <br />