Area that slopes down on drains to the main river is called:
river basin
mouth of the river
head of the river
tail of the river
The ocean that is named after a country
Pacific
Indian
Atlantic
Arctic
What makes the lakes saline?
it is perennial
it is fresh
high rate of evaporation
it is non-perennial
Water contained in all oceans constitute about
96.5%
71%
29%
92.4%
Ground water is the____________source of water for man.
ordinary
secondary
main
unimportant
Areas that receive large amount of rainfall have the problems of flood and marshy lands in:
Desert areas
Polar areas
Equatorial areas
Hilly areas
The largest of all oceans:
