Estimated quantity of global water is __________which covers about 70% of earth?
A. 1.30x109km3
B. 1.32x109km3
C. 1.33x109km3
D. 1.35x109km3
A. 1.30x109km3
B. 1.32x109km3
C. 1.33x109km3
D. 1.35x109km3