0.5 points Save Drainage basins are bowl-shaped depressions with a lake in the middle, and all
streams in the basin discharge their water and sediment into that lake.
0.5 points Save Reduced volumes of sea ice may increase the amount of coastal erosion in
parts of Canada.
A "100-year flood" has a _______ percent chance of occurring in any given year.
f. can't tell without more information
0.5 points Save Barrier islands are associated with an erosional coastline.
The discharge of a stream is the volume of water that passes a given point in unit of time (for
example, 50 cubic metres per second).
Stream gradient is the only factor that controls stream velocity.
Please correctly match the following sentences and terms.
A _____ is a bar of sediment that
connects a former island to the
_____ carry fine-grained sediments
out of the surf zone into deeper
_____ is the movement of sand
a. beach face
f. wave refraction
g. longshore drift
parallel to the shore.
A _____ is a ridge of sediment that
cuts a bay off from the ocean.
The steepest part of a beach is the
Coastal straightening occurs
because of _____.
_______ are sometimes built
perpendicular to shore in an attempt
to protect beaches that are losing
sand from longshore drift.
Tidal deltas are usually associated
The bending of waves as they
approach the shore is called
Drowned coasts may be marked by
____, glacially cut valleys flooded
by rising sealevel.
h. rip currents
i. gaps in barrier island systems
j. wave erosion of headlands and deposition in
Wavelength is the horizontal distance between a wave-crest and the adjacent wave-trough.
A(n) ___ stream flows in a network of rivulets (subchannels) around numerous
a. all of the other answers
How can landslides be prevented during construction? (choose all that apply)
a. install retaining walls
b. add vegetation
c. cut steeper slopes
d. install water drainage systems
Drainage basins are bowl-shaped depressions with a lake in the middle, and all streams in the basin
discharge their water and sediment into that lake.
An alluvial fan is a fan- or cone-shaped pile of sediment that forms where a stream emerges from a
narrow mountain canyon.
Why are there deserts around 30* latitude?
a. The best known deserts lie in a belt 10-15* wide.
b. Specialized plants have adapted to grow in areas of less than 25 cm rain per year.
c. sinking air is compressed and warms so it evaporates lots of moisture
d. rising air pushes the storm clouds away
e. all of the above
Only small portions of most deserts are covered with sand dunes.
Paved areas and storm sewers decrease the rate of surface runoff of water.
Please select ALL of the following which are triggering mechanisms for mass wasting:
a. episodic saturation of debris with water
b. lots of vegetation
c. film of water around fine particles
e. heavy rainfall
f. repeated freezing and thawing
g. frequent but light rainfall or snow
h. undercutting of bottom of slope
i. long periods of drought with rare episodes of heavy precipitation or snow melt
j. weight added to the upper part of the slope