The main source of usable water on the Earth is

examrobotsa's picture
Q: (SSC/0)
The main source of usable water on the Earth is

question_subject: 

Geography

question_exam: 

SSC

stats: 

0,25,12,4,3,25,5

keywords: 

{'usable water': [1, 0, 0, 0], 'underground water': [0, 0, 1, 1], 'oceans': [8, 1, 8, 19], 'earth': [0, 1, 1, 1], 'precipitation': [1, 0, 0, 4], 'main source': [1, 0, 0, 2], 'rivers': [3, 2, 8, 8]}