_________ percent of the earth's surface is occupied by seas and oceans.
Seas and oceans cover___percent of the Earth's surface.
The ultimate source of all water on the earth is
(a) oceans and seas
(b) spring and wells
(c) rivers and lakes
(d) rain
Question 2
Seas and oceans are full of water on earth. However, a very small percentage of water present on earth is available for us. This percentage is roughly (a) .006% (b) 0.006% (c) 0.6% (d) 6%