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Geomorphology
Final Exam
| Question | Answer |
|---|---|
| Forms where a stream flowing out of mountains debouches on to a plain. | Alluvial Fan |
| Remains of old valley floors that are left sitting on valley sides after river downcutting. | River Terraces |
| ____ _____ often slope downstream. | River Terraces |
| Caused by a hydrological or climatic shift that causes renewed downcutting. | River Terraces |
| Type of terrace where vertical downcutting by the river is faster than the lateral migration of the river channel. | Paired Terraces |
| Type of terrace where the channel shifts laterally faster than it cuts down. | Unpaired Terraces |
| Start in valleys where a river cuts down through the bedrock to produce a v-shaped valley. Often uplift strands the surface(strath) as downcutting continues | Bedrock Terrace |
| Borne, deposited, produced, or eroded by the wind | Eolian |
| Responsible for the regional or local weathering and erosion of desert materials (e.g., sand) | Regional or Local winds |
| _______ environments require very low annual rainfall (less than 25cm), meager vegetation, | Eolian |
| requires an environments where wind erosion and other erosional processes are preserved. | Eolian Erosional Forms |
| Lag deposits, desert pavements, ventifacts, yardangs, and basins are ______ | Types of erosional landforms |
| Saltation, suspension, and creep | The processes by which wind transport loose materials. |
| The result from deflation of poorly sorted deposits (alluvium). The wind removes finer surface particles, leaving a blanket of material too coarse to undergo deflation. | Lag Deposits |
| Surfaces covered by lag deposits where the stone cover is continuous and the particles are generally flat. | Stone Pavements or Desert Pavements |
| Large or small depressions that are highly variable in size and depth, that go no deeper than the water table. | Deflation hollows or blowouts |
| Closed depressions that are often associated with clay dunes or lunette dunes. They can also be influenced by bioturbation. | Pans |
| A streamlined hill carved from bedrock or any consolidated or semiconsolidated material by the dual action of wind abrasion, dust and sand, and deflation. | Yardangs |
| Stony desert surfaces caused by abrasion of wind blown particles. They do not require one prevailing wind direction. Dust and silt probably more important than sand. | Ventifacts |
| A reduction in sand supply, change in wind velocity or wind direction, and barriers may result in ______ | The deposition of sand |
| ___, _____, _____, and ____ are types of sand depositional forms | Dunes, dune fields, sand seas, and loess. |
| Deposition of sand, an initial sand patch to trap saltating grains, 1-5m lower width. | Dune Formation |
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