Approximately 70 percent of the earth is covered by water. Of this amount, approximately _____ percent of it is suitable for human use.
A. 10
B. 25
C. 50
D. less than one
Answer:D
Approximately 70 percent of the earth is covered by water. Of this amount, approximately _____ percent of it is suitable for human use.
A. 10 B. 25 C. 50 D. less than one