Which of the following techniques is the simplest way to make water safe to drink?
A) implementing river diversion projects B) eliminating community wells
C) using solar radiation to purify water D) employing modified irrigation technology
Question 2
Water is purified through SODIS by leaving water in the sun, in clear plastic containers, for at least ________ hours.
A) 4 B) 7 C) 5 D) 6