Deposition by Streams

Which profile best shows the general depositional pattern that occurs when water from a stream enters

the ocean?

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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?

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Four quartz samples of equal size and shape were

placed in a stream. Which of the four quartz samples

below has most likely been transported farthest in the

stream?

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Which size particle will remain suspended longest as

a river enters the ocean?

• pebble

• sand

• silt

• clay

The cross section shows a stream flowing downhill. Points A through D are locations in the stream. At what point would the most deposition occur.

• A

• B

• C

• D

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?

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Base your answer to the following question on the diagram, which shows a coastal region in which the land slopes toward the ocean. Point X is near the top of the hill, point Y is at the base of the hill, and point Z is a location at sea level. The same type of surface bedrock underlies this entire region. A stream flows from point X through point Y to point Z. This stream is not shown in the diagram. Which cross section best shows the pattern of sediments deposited by the stream as it enters the ocean near point Z?

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Base your answer to the following question on the cross section and data table. The cross section shows a sediment-laden river flowing into the ocean. The arrows show the direction of river flow. Different zones of sorted sediments, A, B, C, and D, have been labeled. Sediments have been taken from these zones and measured. The data table shows the range of sediment sizes in each zone. How is this pattern of horizontal sorting produced?

• High-density materials generally settle more slowly.

• Rounded sediments generally settle more slowly.

• Dissolved minerals are generally deposited first.

• Bigger particles are generally deposited first.

The diagram shows four identical columns containing the same amount of water. Four different-sized spherical particles, made of the same uniform material, are dropped into the columns and settle to the bottom. Which graph best shows the relative settling times of the four particles?

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