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Geol
Chapter 10
| Question | Answer |
|---|---|
| Downcutting (also known as rejuvenation) of a stream may be due to ________. | uplift of land |
| The suspended load of a stream ________. | usually consists of fine particles |
| A ________ stream pattern is developed only on growing mountains like volcanoes or where the land surface is tectonically doming upward. | radial |
| A ________ stream pattern develops on lands underlain by alternating bands of resistant and less-resistant rock. | trellis |
| The most common drainage pattern is ________. | dendritic |
| ________ is an abandoned, cutoff, meander loop. | An oxbow |
| A stream begins at an elevation of 200 meters and flows a distance of 400 kilometers to the ocean. What is the average gradient? | 0.5 m/km |
| ________ are characteristics of downcutting streams and a youthful stage of valley evolution. | Rapids and lots of whitewater |
| ________ generally constitutes the highest percentage of the annual sediment load moved by a stream. | Suspended |
| A ________ drainage pattern is common in areas where the bedrock is criss-crossed by a series of joints and/or faults. | rectangular |
| Which of the following features characterize wide streams and valleys? | natural levees; broad floodplains |
| As stream discharge increases ________. | velocity, width, and depth increase |
| The single most important erosional agent is ________. | running water |
| The capacity of a stream measures the maximum size of particles it is capable of transporting. | False |
| Gradients usually decrease downstream in a major river system. | True |
| Alluvium refers to stream deposits, mainly sand and gravel. | True |
| The lowest base level for most streams is sea level. | False |
| Point bars are depositional features located along the outer portions of meander bends. | False |
| Stream discharge is defined as the quantity of water flowing past a specific channel location per unit time. | True |
| More water is evaporated from the ocean than is returned to the ocean by precipitation. | True |
| One river can be the base level for another. | False |
| The Mississippi River is North America's largest river in terms of discharge. | True |
| A V-shaped valley and no floodplain indicate a youthful, downcutting stream. | False |
| If two streams are identical in every respect except for gradient, the stream with the higher gradient would have the greater velocity. | True |
| Creating artificial cutoffs increases stream velocity. | True |
| Floods are the least destructive of all geologic hazards. | False |
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