List the different ways that a stream can erode its channel. - Answer-Quarrying~ removal of blocks from the bed of a channel
Abrasion~ bed and banks of a bedrock are bombarded by particles carried into the flow.
What is an incised meander? - Answer-~ Meanders in steep, narrow valleys
~ Caused ...
Geology 1010 Exam 4 Questions with
Latest Update
List the different ways that a stream can erode its channel. - Answer-Quarrying~
removal of blocks from the bed of a channel
Abrasion~ bed and banks of a bedrock are bombarded by particles carried into the flow.
What is an incised meander? - Answer-~ Meanders in steep, narrow valleys
~ Caused by a drop in base level or uplift of the region
What is the order of deposition, according to particle size, as a stream slows down and
starts dropping its load? - Answer-Called sorting.. Starts with largest particles first.
What is a base level? - Answer-lowest point to which a stream can erode
What kinds of particles make up the suspended load of a stream? - Answer-Fine sand,
silt, and clay particles are carried this way.
What are the three types of load that are transported by a river? - Answer-1. Dissolved
load
2. Suspended load
3. Bed load
What is the most important factor influencing a stream's ability to erode? - Answer-Rain
water
What is alluvium? - Answer-Stream sediments
Describe the longitudinal profile of a typical river. - Answer-Starts out a steep rugged
gradient splitting into many smaller streams. As it becomes more of a gentle gradient,
the streams combine into one stream and then sometimes split into a few streams at the
mouth of the stream as it empties into the ocean.
Cross section of a stream channel along its defending course from the head to the
mouth.
Which type of load, transported by a stream, contains the greatest amount of sediment?
- Answer-Suspended load
What is a drainage basin? - Answer-The land area that contributes water to a stream
(water shed)
What is a divide? - Answer-An imaginary line that separates the drainage of two
streams; often found along a ridge
, What are the characteristics of a narrow valley or youthful stream? - Answer-~ V-
shaped
~ Downcutting toward base level
~ Features often include rapids and waterfalls
What are the characteristics of a wide valley or old age stream? - Answer-Flood plains
and meanders
What is the single most important agent of erosion? - Answer-running water
What are rills? - Answer-a small stream
What is stream gradient? - Answer-Vertical drop of a stream over a specified distance
What measuring term is used to describe the size of a stream? - Answer-Discharge
What is the most common unit used to measure the flow of a stream? - Answer-Wetted
Perimeter
What is the world's largest river, according to its rate of flow? - Answer-Amazon
What is the beginning of a stream called? - Answer-Head or headwaters
What is the end part of a stream called? - Answer-Mouth
What is a pothole? - Answer-circular depressions common to some bedrock channels.
They are created by the abrasive action of particles swirling in fast moving eddies.
In what kind of load does saltation occur? - Answer-Bed load
What is an oxbow lake? - Answer-An abandoned bend
What is an alluvial fan? - Answer-Fan shaped deposits that accumulate along steep
mountain fronts
What are natural levees? - Answer-The elevated landforms composed of alluvium that
parallel some streams and act to confine their waters, except during flood stage.
What is a braided stream? - Answer-Stream consisting of numerous intertwining
channels
What is a delta? What do deltas look like? - Answer-Accumulation of sediment formed
where a stream enters a lake or ocean
They grow outward from a shoreline, the stream's gradient continually decreases (p
230)
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