Acid rain is a type of __________pollution.
air
sound
water
soil
What slows down the flow of water?
Check dams
boiling
precipitation
salinity
The store house of many resources like fish,minerals and energy is______.
river
pond
oceans
sea
Large amount of _______________is buried in the ocean floor.
steel
cars
gold
petroleum
What makes the lake saline?
it is perennial
it is fresh
high rate of evaporation
it is non-perennial
The longest river in the world
Nile
Ganga
Amazon
Krishna
Around _________________% of the earths surface is covered with water.
21%
60%
71%
91%
Areas that receive large amount of rainfall have the problems of flood and marshy lands in:
Desert areas
Polar areas
Equatorial areas
Hilly areas
Heat of sun changes water in to :
Rain
Snow
Vapour
Dew
The process of changing water in to its vapour is called:
Precipitation
Evaporation
floods
condensation
