Quiz 6 key

limestone is made of carbonate minerals; sandstone is made of cemented sand grains (could be a variety of minerals); so limestone could slowly dissolve over time, but sandstone would be weaker if the cement holding it together was not very strong.
the constant action of the waterfall breaking off little pieces of rock consitutes a continuous process of mass wasting where rock material is eroded and moved downslope
approximately 1000 ft. over 197 years = approximately 5 ft/year
the dam causes water behind it to slow down (velocity decreases) and the channel to become wider and deeper; downstream from the dam (in front of it), the water is let out at the base at a higher speed so velocity increases but the channel is shallower and narrower.
In either case, upstream of the dam, V decreases while W and D increase so Q likely stays the same; downstream of the dam, V increases but W and D decrease so Q again likely stays the same.