Quiz #29

14 November 2011

S.I. Session 29 Quiz

This quiz covers material from the lecture on Friday, November 11^th.

Part a) Match the term to its definition:

                TERMS:

a)Wind                 b)Barchan                           c)Air Circulation

d)Easterlies        e)Saltation                          f)Coriolis Effect

g)Westerlies      h)The Sun’s Rays              i)Loess

                DEFINITIONS:

1)__This is caused by solar heating and earth’s rotation.

2)__These crescent shaped dunes form if there is a limited sand supply and a unidirectional wind.

3)__The process by which sand particles jump up and over the crest of a sand dune.

4)__These are unstratified windblown silt deposits.

5) __This is the primary agent of sediment transport in deserts.

6)__This is caused by the earth’s rotation, winds are deflected to the right in the Northern Hemisphere.

7)__These strike the earth at an angle near the poles and vertically near the equator.

8)__These prevail in temperate zones.

9)__These prevail in tropic zones.

Part b) What factors affect the shape of a sand dune?

Part c) True or False:

                Mark T (true) or F (false) in the blank provided:

                                1)__Geological processes shaped by wind are lacustrine.

2)__The amount of sand moved by wind rises rapidly with wind speed.

3)__The maximum height of a sand dune depends on the wind speed at the base of the sand dune.

4)__Sand particles slip down the windward face of a sand dune.

5)__The angle of repose of a sand dune is 35 degrees.

6)__A sand dune migrates forward, similar to a conveyor belt.

7)__Air rises at the equator, cools, and then releases moisture in the form of storms.

8)__Prevailing westerlies exist in the tropics.