Nearly 97% of the water on earth is unusable by humans because of its this lack of usability is due to the fact that water 1. a. temperature. b. salinity. c. impurities. 2. a. is a universal solvent. b. expands upon freezing. c. is transparent.

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u.s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u.s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u.s.