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<br /> <br />18 <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br /> <br />J <br /> <br />. <br /> <br />./ <br /> <br />. <br /> <br />, <br /> <br />, / I <br /> <br />. <br /> <br />. <br /> <br />I <br /> <br />. <br /> <br />- - <br /> <br />- <br /> <br />-- - <br />- - - <br />...- ... -- <br />...- - , <br /> <br />Figure 4. <br /> <br />The hogbacks of the Rocky Mountains are the result <br />of the resistant layers of rock being pushed up <br />around the central core of the mountains (12:135). <br /> <br />. <br /> <br />. <br />