Streams and Deposition

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

Tags

NGSS.MS-PS1-2

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

Tags

NGSS.MS-PS2-5

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