Chapter 20

Sediment is deposited as a river enters a lake because the:

• velocity of the river decreases

• force of gravity decreases

• volume of water increases

• slope of the river increases

A river’s current carries sediments into the ocean. Which sediment will most likely be deposited in deeper water farthest from the shore?

• pebble

• sand

• silt

• clay

The largest particles that a stream deposits as it enters a pond are 8 centimeters in diameter. The minimum velocity of the stream is approximately:

• 100 cm/sec

• 200 cm/sec

• 300 cm/sec

• 400 cm/sec

A stream is transporting the particles W, X, Y, and Z. Which particle will most likely settle to the bottom first as the velocity of this stream decreases?

• W

• X

• Y

• Z

When small particles settle through water faster than large particles, the small particles are probably:

• lighter

• flatter

• better sorted

• more dense

How are pieces of bedrock material that are broken from a cliff and deposited by a landslide at the base of the cliff best described?

• rounded and sorted

• rounded and unsorted

• angular and sorted

• angular and unsorted

When wind and running water gradually decrease in velocity, how are the transported sediments typically deposited?

• all at once, and are unsorted

• all at once, and are sorted by size and density

• over a period of time, and are unsorted

• over a period of time, and are sorted by size and density

Which cross section best represents the pattern of sediments deposited on the bottom of a lake as the velocity of the stream entering the lake steadily decreased?

• Diagram 1

• Diagram 2

• Diagram 3

• Diagram 4

What depositional feature is shown at the point where the Mississippi River enters the Gulf of Mexico in the satellite photograph?

• a delta

• a sandbar

• a barrier island

• an outwash plain

How does the groin structure affect the distribution of sand along the shoreline according to the diagram?

• It causes the beach to become wider on the western side of the groin.

• It results in the beach becoming wider on the eastern side of the groin.

• It makes the beach narrower on both sides of the groin.

• It leads to the beach becoming wider on both sides of the groin.