What percent of water is not easily accessible or usable on earth?
*a. 6% b. 12.5% c. 50% d. 99% subtract the answer from the last question from 100%. what does the remainder represent and what are the sources of this percentage of water?
a. 97% rivers only b. 1% lakes, rivers and ground water *c. 99.4% lakes only d. 50% atmosphere and soil moisture you.

If we review the changes in the landscape surrounding the great salt lake in utah we can see a change in topography. look at the area to the south of the lake. what change has occurred during the last twenty-nine years? a) erosion of the hills b) an increase in marshland c) flooding of the area and the development of wetlands d) deposition of sediments and an increase in elevation