The process of changing water in to its vapour is called:
Precipitation
Evaporation
floods
condensation
Areas that receive large amount of rainfall have the problems of flood and marshy lands in:
Desert areas
Polar areas
Equatorial areas
Hilly areas
___________are often used to transport logs.
pond
lakes
river
road
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
Large amount of _______________is buried in the ocean floor.
steel
cars
gold
petroleum
Big dams are being built across:
Oceans
Lakes
Rivers
Pond
Ground water is the____________source of water for man.
Ordinary
secondary
main
unimportant
Supply of water to farms is called :
extraction
irrigation
inflation
percolation
What slows down the flow of water?
Check dams
boiling
precipitation
salinity
Around _________________% of the earths surface is covered with water.
21%
60%
71%
91%