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Ch 7

Test Description: Earth Science

Instructions: Answer all questions to get your test result.

1) What is a blowout?

Aa shallow depression caused by abrasion Ba shallow depression caused by deflation Ca stony surface layer caused by abrasion Da stony surface layer caused by deflation

2) How does wind transport sand grains

Awind transport sand grains only during dust storms BEqual quantities are transported suspended in the air and as bed load Cby saltation as part of the bed load Dmainly as part of the suspended load

3) When wind creates a sand dune, the sheltered side of the dune

Ahas the same incline as the windward side Bis steeper than the windward side Chas no incline Dhas a more gently sloping angle than the windward side

4) Over time, sand dunes tend to migrate

Ain the same direction as the wind blows Btoward the wind Cin random directions Dperpendicular to the movement of the wind

5) If the steep face of a sand dune is on the southeast side of the dune, then the prevailing wind in this area is from the

Anortheast Bsouthwest Csoutheast Dnorthwest

6) The thick loess deposits in South Dakota, Nebraska and Iowa

Aare composed of windblown sand Bhad their source in desert regions of the west Care in the form of tranverse dunes Dhad their source as glacial sediments

7) Sand dunes that form scalloped rows of sand at right angles to the wind are called

Astar dunes Bparabolic dunes Ctransverse dunes Dbarchanoid dunes

8) Long sand ridges that are oriented more of less parallel to the prevailing wind are called

Alongitudinal dunes Bparabolic dunes Cbarchan dunes Dtransverse dunes

9) (in your book p 206 figure 22) Which diagram illustrated lingitudinal lines?

AD BF CA DB

10) What type of sand dune would most likely form if the sand supply is limited, the wind direction is constant and vegetation is sparse

Astar dunes Btransverse dunes Cbarchan dunes Dlongitudinal dunes

*select an answer for all questions

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