Chapter 18 Landscape Evolution Geomorphology Topography is a Balance Between Erosion and Tectonic Uplift Topography is a Balance Between Erosion and Tectonic Uplift Relief The relief in an area is the maximum difference between the highest and lowest elevation We have about 7000 feet of relief between Boulder and the Continental divide Relief Mountains control weather and increase erosion Isostasy Mountains Have Roots Mountains and Valleys A mountain is a large mass of rock that projects above surrounding terrain A mountain range is a continuous area of high elevation and high relief A valley is an area of low relief typically formed by and drained by a single stream A basin is a large low lying area of low relief In arid areas basins commonly have closed topography no river outlet to the sea Mountains Typically occur in ranges Glaciated forms Horn Ar te Desert Mountains Vertical Cliffs Alluvial Fans Mountain Landforms Horn Deserts Vertical Cliffs and Alluvial Fans Valleys and Basins River Valleys U shape Glacial V shape Active Water erosion Flat floored depositional flood plain Tectonic Fault Valleys Basins Tectonic origin San Luis Valley Jackson Hole Great Basin U shaped Valley Glacial Erosion V shaped Valley Active water erosion Flat floored Valley Depositional Flood Plain Flat Floored Valley Colorado National Monument Canyonlands Desert and Semi arid Landforms A cuesta is an asymmetric ridge in A hogback is ridge formed by near dipping sedimentary rocks as the Flatirons vertical resistant sedimentary rock Dakota Ridge Badlands are areas of deeply gullied topography unsuitable for agriculture Cuesta Hogback Hogback Cuesta Badlands Landform Terms Relief Mountain Mountain Range Isostasy Valley Basin Horn Ar te Alluvial Fan U shaped Valley V shaped Valley Cuesta Hogback Badlands
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