# How does Physical Weathering change the chemical composition of a rock material? It creates new, different...

###### Question:

How does Physical Weathering change the chemical composition of a rock material? It creates new, different minerals from the old minerals It doesn't change the chemical composition of a rock material It dissolves soluble minerals, moving ions into solutions It relies on chemical reactions to break down the minerals
In the ASCE or USBR Rock Weathering Descriptors, the description of "Moderately Severe" says that all (minerals) except quartz are discolored or stained, and that all feldspars are dull, discolored and turning to clay. Why is the quartz not discolored or stained while the feldspars are? Quartz weathers faster than feldspars Physical weathering affects feldspars more than quartz The feldspars are less resistant to weathering than quartz Feldspars tend to be more colorful than quartz, which is usually clear
Physical weathering has no influence on the rate of chemical weathering True False
Which of the following is a residual weathering product of Feldspars and Amphiboles? K+, Ca2+, and Na2+ ions Silica Quartz grains Clay
Which of the following answers is not correct: The Unified Soil Classification System (USCS) provides a means to classify soils based partially on the plasticity characteristics of (-200) fines The Unified Soil Classification System (USCS) provides a means to classify soils based partially on the grain size distribution of soil particles from (-3 inch) Gravel to (-200) fines The Unified Soil Classification System (USCS) provides a means to classify soils based partially on the grain size distribution of soil particles from (+ 12 inch) Boulders to (-200) fines
What mineral makes a cohesive soil cohesive? Quartz Clay Muscovite Olivine
Which best describes the Plastic Limit (PL) in the Atterberg Limits? Moisture content where soil changes from plastic to brittle Moisture content where a semi-solid soil stops shrinking and becomes solid Moisture content where soil first has shear strength Moisture content coinciding with the plasticity index
How does grain angularity and grain size distribution affect a soil's permeability? (Assume the average grain size corresponds to a medium sand) Angular grains in a well graded sand result in greater permeability than rounded grains in a poorly graded sand The angularity of the grains has no effect on the permeability of a soil The grain size distribution of a soil has no effect on its permeability Angular grains in a well graded sand result in lower permeability than rounded grains in a poorly graded sand
What factors govern the rate of soil erosion? Rainfall rate and duration All of the above (and below) Slope and vegetation O Soil gradation and composition

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