The Solid Earth - Chapter 4: Wind Deposits

Question 1

Two distinctive types of wind deposits

Answer 1

Blankets of silt that were in suspension

Mounds of sand from the bed load

Question 2

This is a material that has been deposited by dust storms and includes windblown silt

Answer 2

Loess

Question 3

When loess is breached by streams or road cuts it tends to maintain ____ cliffs and lack visible layers

Answer 3

vertical

Question 4

The distribution of loess indicates that there are two primary sources for this sediment:

Answer 4

Glacial, deserts

Question 5

When does wind release its load of sediment

Answer 5

Velocity falls and energy available diminishes

Question 6

Sand begins to accumulate wherever an ____ across the path of the wind slows the movement of air

Answer 6

Obstruction

Question 7

Winds commonly deposit sand in mounds or ridges called

Answer 7

dunes

Question 8

True or false: a dune creates a stronger obstacle as it grows

Answer 8

True

Question 9

Does the windward or leeward size of a dune have a steep slope?

Answer 9

Leeward

Question 10

The leeward slope of the dune is called the ____ face

Answer 10

slip

Question 11

The sloping layers formed in the direction of the wind on the slip face

Answer 11

cross beds

Question 12

This type of dune is solitary and shaped like crescents with tips pointing downward

Answer 12

Barchan

Question 13

Barchan dunes form where supplies of sand are limited and the surface is relatively __________ (3x)

Answer 13

flat, hard, lacking vegetation

Question 14

This type of dune is formed where vegetation is sparse/absent and sand is plentiful and features a series of long ridges separated by troughs and oriented at right angles

Answer 14

Transverse

Question 15

A common dune form that is between barchans and transverse which form scalloped rows of sand oriented with right angles to wind

Answer 15

Barchanoid

Question 16

Long ridges of sand that form parallel to the prevailing wind and where sand supplies are limited

Answer 16

Longitudinal

Question 17

This type of dune forms when vegetation partially covers the sand. The shape is like barchans but the tips point into the wind.

Answer 17

Parabolic

Question 18

This type of dune is an isolated hill of sand with a complex form, often resembling multipointed shapes

Answer 18

Star