Quiz #30

15 November 2011

S.I. Session 30 Quiz

This quiz covers material from the lecture on Monday, November 14^th.

Part a) Match the term to its definition:

                TERMS:

a)Chemical          b)Erosion                             c)Talus Slope

d)Physical            e)Playa Lake                       f)Dunes

g)Storms              h)Alluvial Fan                     i)Salinization

                DEFINITIONS:

1)__An evaporate deposit caused by the evaporation of salty water.

2)__These are infrequent in deserts, but when they do occur they often have high corrosive capabilities and lead to flash floods.

3)__This type of weathering dominates in desert climates.

4)__These are eolian formations deposited by wind.

5) __These desert sedimentary structures are deposited as a desert stream encounters flat terrain.

6)__This type of weathering forms clay minerals and Iron oxides.

7)__This is an apron of sediment that occurs at the base of a cliff.

8)__&__ Farmlands and grazing lands are being lost because these two processes are negatively affecting the soil.

Part b) Explain the process by which pediments are formed:

Part c) True or False:

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

                                1)__Deserts make up 20% of earth’s surface.

2)__Dunes are fluvial, deposited by wind.

3)__Chemical weathering dominates physical weathering in desert climates.

4)__Flash floods are commonplace in deserts during periods of heavy rain.

5)__Wind is the main weathering agent in deserts.

6)__Oftentimes, a playa lake is a remnant of a glacier.

7)__Desert areas typically receive 5 to 25 millimeters of precipitation per year.

8)__Excessive cultivation is one of the main causes of desertification.