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20 questions
Which particles will be transported by a stream moving at a velocity of 2 cm/s?
A) Some pebbles, sand, silt, and clay, only
B) Some sand, silt, and clay, only
C) Some silt and clay, only
D) clay, only
In a soil sample, the particles have the same shape but different sizes. Which graph best represents the relationship between particle size and settling time when these particles are deposited in a quiet body of water?
A
B
C
D
If the velocity of a stream decreases from 50 centimeters per second to 5 centimeters per second, which sediments will deposit?
A) small cobbles and large pebbles
B) small pebbles and large sand
C) small sand and large silt
D) small silt and large clay
Quartz particles of varying sizes are dropped at the same time into deep, calm water. Which cross section best represents the settling pattern of these particles?
A
B
C
D
The four particles shown in the table below are of equal volume and are dropped into a column filled with water. Which particle would usually settle most rapidly?
A
B
C
D
The four particles shown in the table below are of equal volume and are dropped into a column filled with water. Which particle would usually take the longest to settle?
A
B
C
D
Four different-sized spherical particles, made of the same uniform material, are dropped into the columns of water and settle to the bottom. Which graph best shows the relative settling times of the four particles?
A
B
C
D
Clay, silt, and sand are added to a jar of water. The jar is shaken and then allowed to stand quietly for a number of hours. The result of this demonstration could be best used as a model to show that
A) particles with the lowest density settle the fastest
B) particles with the largest size/diameter settle the fastest
C) water is denser than clay, silt, and sand
D) the bottom layer of a series of sediments is the youngest
Each of the rock particles below has the same density and volume. Which particle will most likely settle at the fastest rate in moving water?
A
B
C
D
Which characteristics of a particle would usually result in the longest settling time for the particle in calm water?
A) low density and round shape
B) low density and flat shape
C) high density and round shape
D) high density and flat shape
The graph below is incomplete because it does not identify the sediment characteristic (X) that would produce the line plotted on the graph. Which label should be placed on the horizontal axis to accurately complete the graph?
A
B
C
D
The table below shows the density of four mineral samples. If the shape and size of the four mineral samples are the same, which mineral will settle most slowly in water?
A) cinnabar
B) magnetite
C) quartz
D) siderite
When small particles settle through water faster than large particles, the small particles are probably
A) lighter
B) flatter
C) more angular
D) more dense
Particles of sediment A and sediment B were mixed in a container of water. They settled in the pattern shown in the diagram below. The pattern indicates that, compared to particles of sediment B, particles of sediment A have a...
A) smaller volume
B) greater density
C) smaller surface area
D) rougher texture
Which graph best represents the relationship between the slope of a river and the particle size that can be transported by that river?
A
B
C
D
As the velocity of a stream decreases, the amount of deposition in the water of the stream...
A) decreases
B) increases
C) remains the same
Two streams, A and B, carry the same volume of water, but stream A has a greater velocity. The most likely cause of this greater velocity would be that stream A
A) has more curves
B) has a wider streambed
C) flows down a steeper slope
D) travels over less resistant bedrock
An increase in the velocity of a stream is most likely due to..
A) an increase in stream discharge
B) an increase in the width of the riverbed
C) a decrease in the slope of the stream channel
D) a decrease in the amount of material held in suspension
Which graph best illustrates the relationship between stream velocity and stream discharge for a given portion of a stream?
A
B
C
D
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