Florida Science Grade 6

Section 1: Surface Water

Surface Water

1.
Runoff is water that __________.
A)doesn't soak into the ground or evaporate
B)creates groundwater
C)soaks into the ground
D)we drink
2.
Which is a factor that affects runoff?
A)the length of time that rain falls
B)gravity
C)all of the above
D)the amount of rain that falls
3.
Vegetation affects runoff by _________ water.
A)speeding up
B)soaking up
C)slowing down
D)cleaning
4.
The wearing away of soil and rock is called __________.
A)runoff
B)erosion
C)drainage
D)infiltration
5.
What is the difference between rill and gully erosion?
A)Gully erosion creates much smaller channels than rill erosion.
B)Rill erosion creates much larger channels than gully erosion.
C)Gully erosion creates much larger channels than rill erosion.
D)Gully erosion takes much longer than rill erosion.
6.
How does a stream channel become deeper and wider?
A)The force of the water forces the edges outward.
B)Gravity pulls the stream channel downward.
C)Sediment is moved out by humans.
D)Sediment is removed by the running water.
7.
Streams are parts of _________ systems.
A)lake
B)ocean
C)rill
D)river
8.
What is the largest drainage basin in the United States?
A)the Mississippi River
B)the Colorado River
C)the Snake River
D)the Missouri River
9.
What defines a stream as a young stream?
A)The period of time the stream has been there.
B)It flows quickly through a steep valley.
C)the size of the stream
D)the location of the stream
10.
What part does erosion play in the development of mature streams?
A)It pulls sediments from the riverbed.
B)It creates channels.
C)It wears down the rocks that cause waterfalls in young streams.
D)It smoothes the bottom of the riverbed.
11.
Broad, c-shaped curves in streams are called __________.
A)levees
B)geysers
C)water tables
D)meanders
12.
A delta is created when __________.
A)sediments are deposited as water empties into a river
B)sediments are deposited as water empties into an ocean
C)river water empties from a mountain valley onto an open plain
D)a rill or gully empties into a stream
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