Besides gradient and load, what else affects stream erosion?
A. discharge
What kind of river has a wide, flat flood plain and many bends where it deposits rock and soil?
B. an old river
What is the rock and soil deposited by streams called?
a. sediment
b. sinkholes
c. aquifer
d. stalagmites
a. sediment
Besides deltas and placer deposits, what else is a result of stream deposits?
a. smaller channels
b. smaller rocks and minerals
c. dissolved calcium and sodium
d. floods and alluvial fans
d. floods and alluvial fans
When a stream deposits sediment, what can happen to the land?
a. it decreases in size
b. it increases in size
c. it stays the same
d. it evaporates
b. it increases in size
What method of flood control involves building up the banks of a river to keep the river within its channel?
a. alluvial fan
b. levee
c. dam
d. placer deposit
b. levee
What are the buried pipes that distribute cleaned water into the ground?
a. artesian spring
b. septic tank
c. drain field
d. Ogallala aquifer
c. drain field
If a sewer pipe is leaking from an apartment building and a factory is dumping waste into the same river, what kind of pollution is it?
a. point-source pollution
b. nonpoint-source pollution
c. runoff pollution
d. fertilizer pollution
b. nonpoint-source pollution
The water table is found between what two areas?
a. zones of aeration and saturation
b. areas of percolation and evaporation c. areas of runoff and ground water
d. locations of deltas and alluvial plains
a. zones of aeration and saturation
A watershed is land that is drained by
a. a septic tank.
b. a water system.
c. runoff.
d. an alluvial plain.
b. a water system.
While a youthful river is steep and fast flowing, a mature river
a. has fewer tributaries.
b. has poor drainage.
c. has few waterfalls.
d. has terraces.
c. has few waterfalls.
Drip irrigation delivers water directly to the
a. roots of crops.
b. farmers.
c. fields.
d. aquifers..
a. roots of crops.
Material carried in a river in solution, or dissolved in the water, is called a
a. bed load.
b. youthful load.
c. dissolved load.
d. suspended load.
d. suspended load.
Large materials, such as pebbles and boulders, carried along by a stream are called a
a. bed load.
b. mature load.
c. suspended load.
d. dissolved load.
a. bed load.
A stream is most likely to deposit the rock and soil that it is carrying when
a. its current slows.
b. its volume increases.
c. it carries many pollutants.
d. it has a steep gradient.
a. its current slows.
Old rivers are characterized by
a. high erosive energy.
b. straight channels.
c. tectonic activity.
d. sediment deposition.
d. sediment deposition.
If a stream has a high discharge rate, it
a. becomes a river.
b. cuts a wider, shallow channel.
c. can carry larger particles.
d. forms more tributaries.
c. can carry larger particles.
Large sinkholes in Florida have formed because
a. rivers erode their banks.
b. the water table was lower than the caves.
c. its rivers have a low discharge rate.
d. the nitrate level was higher than the caves.
b. the water table was lower than the caves.
How does nonpoint-source pollution reach bodies of water?
a. by runoff
b. by evaporation
c. by water treatment
d. by condensation
a. by runoff
What is the upper boundary of the zone of saturation called?
B. water table
What is formed on dry land?
A. an alluvial fan
What are pebbles and boulders carried in a stream called?
C. a bed load
What do river systems help to do?
B. drain watersheds
If a stream has a bed load, it is more likely to cause
.dry wells.
A. erosion.
For percolation to occur, what kind of rock must be on the surface?
D. permeable
While hiking through a river valley, you notice that the sides of the valley look like steps. What kind of river is flowing in the valley?
A. rejuvenate
The difference between an alluvial fan and a delta is that the alluvial fan is deposited at the base of
D. a mountain stream.
Point-source pollution comes from
A. one source.
Sewage treatment plants
C. clean waste water.
What percentage of the Earth? water is drinkable?
A. 3%
What is an offshore column of rock that was once connected to the mainland called?
A. a sea stack
What is a large hole in weak rock near a sea cliff called?
B. a sea cave
Which type of moraine forms along each side of a glacier?
A. lateral moraine
What is the most common type of landslide?
B. slump
A mudflow of a volcanic origin is called a
D. lahar.
Which of the following affects the largest area?
D. continental glacier
Which is a common offshore deposit?
D. a sandbar
What is a jagged ridge that forms in a mountain?
A. arˆte
What is a sharp, pyramid-shaped peak that forms on a mountain?
A. horn
Which of the following smooths the landscape and can flatten mountains?
C. continental glaciers
Which of the following is caused by wave deposits?
A. sandbars
When the ice is gone, hanging valleys may form
A. waterfalls.
What do waves make when they break rock into smaller pieces?
A. sand
What is the steep side of a dune called?
A. slip face
What is the force that moves glaciers?
A. gravity
What are two kinds of glaciers?
D. continental and alpine
What is the movement of material downslope?
A. mass movement
A depression that usually fills with water to form lakes or ponds.
