Quiz #26

3 November 2011

S.I. Session 26 Quiz

This quiz covers material from the lecture on Wednesday, November 2nd.

Part a) Match the term to its definition:

                TERMS:

a)Physical Weathering                   b)Limestone                                      c)Creep

d)Saturated                                        e)Angle of Repose                          f)Granite

g)Quartz                                              h)Slumping                                         i)Damp

j)Mass Wasting                                 k)Chemical Weathering                 l)Factor of Safety

                DEFINITIONS:

1)__This property of sediment grains is based on particle size and angularity.

2)__In this process a mass of unconsolidated material slowly slides as a unit.

3)__The minerals in this rock decay at different rates.

4)__Minerals in a rock are chemically altered or dissolved in this process.

5) __This rock weathers faster than slate.

6)__In this process solid rock is fragmented into smaller pieces.

7)__This number is equal to the shear strength of a rock divided by the shear stress on a rock .

8)__In this process steeply dipping layers of soil slowly move downhill on the scale of millimeters per year.

9)__When sand grains are ______, they tend to be more cohesive.

10)__When sand grains are ______, they tend to be less cohesive, acting as lubricated grains.

11)__Downslope movement of a large mass of earth.

12)__This mineral weathers slower than feldspars, biotite, and magnetite.

Part b) What factors control rates of weathering?

Part c) True or False:

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

                                1)__The larger the amount of exposed surface area a rock has, the faster it will weather.

2)__Feldspar weathers to kaolinite clay.

3)__Pyroxene weathers to kaolinite clay.

4)__The angle of repose for coarse sand is 45 degrees.

5)__The perpendicular component of gravity is enhanced on steep slopes.

6)__Foliated rocks tend to crack into regular fracture patterns called joints.

7)__The weathering of feldspar into kaolinite clay is a hydrolysis reaction.

8)__The weathering of pyroxene into iron oxide is an oxidation reaction.

9)__An earthquake can act as a mass movement trigger.

10)__ The minerals in granite all decay at the same rate.