Streams/erosion/weathering

When the velocity of a stream suddenly decreases, the

sediment being transported undergoes an increase in

• A) mass movement

• B) erosion

• C) deposition

• D) particle density

What is the name of the largest sediment that can be

transported by a stream moving at a velocity of 100

centimeters per second (cm/s)?

• A) silt

• B) pebbles

• D) sand

• C) cobbles

Which statement best describes sediments deposited by

glaciers and rivers?

• Glacial deposits are sorted, and river deposits are

  unsorted.

• Glacial deposits and river deposits are both

  unsorted.

• Glacial deposits and river deposits are both sorted.

• Glacial deposits are unsorted, and river deposits are

  sorted.

The action of the root splitting the bedrock is an

example of

• B) physical weathering

• A) chemical weathering

• C) erosion

• D) deposition

Landscapes will undergo the most chemical weathering

if the climate is

• A) warm and dry

• B) warm and wet

• C) cool and wet

• D) cool and dry

As a quartz pebble is transported by a stream, the

pebble will become more rounded as a result of

• A) deposition in well-sorted layers

• B) dissolving as water is running over the rock

• C) resistance to weathering and erosion

• D) abrasion by colliding with other rocks

Why is this pattern of horizontal sorting produced?

• A) 

  Sediments with a flatter shape settle faster.

• B) 

  Lower density particles settle faster.

• C) 

  Dissolved minerals are deposited first.

• D) 

  Larger particles are deposited first.

What is the approximate velocity of the remaining stream current at point X?

• A) 

  100 cm/sec

• B) 

  70 cm/sec

• C) 

  30 cm/sec

• D) 

  5 cm/sec

Which change in the stream would cause pebbles to be deposited farther offshore?

• A) 

  a decrease in the stream's gradient

• B) 

  a decrease in the amount of sediment in the

  stream

• C) 

  an increase in the stream's discharge

• D) 

  an increase in the density of the sediment

What is the approximate minimum stream velocity needed to move a particle with a diameter of 25.6 centimeters?

• A) 100 cm/sec

• C) 200 cm/sec

• B) 150 cm/sec

• D) 300 cm/sec