7.gravity anomalies indicate differences in: a. density of near-surface rocks b. elevation c. topography d. the shape of the geoid fresh water, including glaciers and icecaps, accounts for about how much of the earth's total water? a. 1% b. 3% c. 10% d. 50% according to the theory of isostasy, the crust: a. tends to establish an elevation inversely proportional to its density b. tends to establish a uniform elevation over the entire earth c. trends to establish an elevation directly proportional to its density d. is fixed and cannot change in elevation which of the following minerals is often found in evaporite deposits? a. quartz b. gypsum c. plagioclase d. kaolinite preservation of organic matter in sedimentary rocks is most successful in the absence of a. carbon dioxide b. nitrogen c. hydrogen sulfide d. oxygen aleomagnetic evidence has provided support of the ideas that: a. new oceanic crust is created at mid-oceanic ridges and moves outward from the ridges b. mountain ranges have low-density roots c. the outer part of the earth's core is liquid d. none of the above which of the following statements about solid solution minerals is true? a. two minerals with the same chemical composition can have different internal structures b. a mineral can have a variable internal structure depending on the chemical composition c. two ions can substitute in a mineral in various proportions without changing the internal structure d. none f he above