Physical Geography Exam #3
The construction of a dam across a river is likely to cause _________ upstream and _________ downstream
Aggradation upstream, Erosion downstream
Sorted glacial drift characteristic of stream-deposited material is called A) erratic B) moraine C) stratified drift D) till
Stratified drift
Terraces can form as a result of A) rejuvenation B) uplift C) erosion D) all of these E) none of these
Terraces can form as a result of A) rejuvenation B) uplift C) erosion D) all of these E) none of these
Which of the following is likely to occur if the gradient of a stream increases? (Assume that the discharge and sediment load remain unchanged.) A) The stream will begin to erode its channel and/or its banks. B) The amount of aggradation in the channel will increase. C) The stream will begin to deposit more of its load. D) The amount of bed load transport will decrease.
The stream will begin to erode its channel and/or its banks
Unlike a stream-cut valley that assumes a characteristic _______ -shape, a glaciallycarved valley evidences a characteristic _______ -shape.
V shape, U shape
When a river reaches a base level, its forward velocity rapidly decelerates as it enters a larger body of standing water and ____________ is formed.
a delta
The opposite of the accumulation zone in a glacier is the
ablation zone
Roche mountonnees form as a result of
abrasion upstream and lee downstream.
Stream drainage patterns are determined by which of the following? A) climatic and hydrologic variability B) differing rock resistance C) slope D) all of these
all the above
Which of the following is true? A) The Earth wobbles on its axis. B) The ellipticity of the Earth's orbit varies through time. C) The Earth's axial tilt varies through time. D) All of the above are true. E) b and c only
all the above
According to classical theories for the evolution of a landscape, the stage of maturity exists when a stream has
begun to cut laterally (side to side), beginning a floodplain
The total possible load a stream can transport is its ____________, whereas a stream's ability to move particles of specific size is its ____________. A) bed load; sediment load B) discharge; competence C) competence; capacity D) capacity; competence
capacity, competence
A glacier that is confined in a bowl-shaped recess is called a
cirque glacier
The great lakes of north america were created by
continental glaciers
The effect of urbanization on a typical stream hydrograph is to A) decrease lag time between storm peak and peak stream discharge B) decrease runoff C) increase lag time between storm peak and peak stream discharge D) create a base flow
decreasing lag time between storm peak and peak stream discharge
watersheds are defined by
drainage divides
Glacial ice can form during the duration of a single winter season in most glacial areas
false
Glacial ice forms more quickly in polar environments than in midlatitude, alpine environments
false
Relative to the entire history of our planet, the earth has been in one of its warmest phases for the past 1.65 million years
false
Drumlins look like....and they occur in....
inverted spoons, in swarms (swarmy spoons)
Which of the following rock types is most affected by fluvial solution?
limestone (fluvial limestone)
Of the world's largest rivers, which has the greatest discharge?
the amazon
During the pleistocene Ice age, many areas of the southwestern us were covered by large lakes
true
If two glaciers with lateral moraines join, a medial moraine is produced
true
Increased velocity and a rough channel can produce a
turbulent flow
The material in a glacial moraine is
unsorted
It is now virtually certain that the dominant cause of recent ice ages is
variations in Earth-Sun orbital relationships
If you live in an area that was flooded by the 100 yr flood last year, you can conclude that
you could be flooded by the 100 year flood again this year
Approximately what percentage of the world's freshwater is frozen?
77%
The degradation of a landscape by weathering, erosion, and transportation has an ultimate "goal" of reducing the landscape down to
Base level
Worldwide, alpine glaciers are presently increasing in size and number.
False
The bulk of ice on Earth is sitting in
Greenland and Antarctica
The suspended load of a stream consists of particles that are
Held aloft in the stream flow