Percentage of fresh water available on the globe
97%
20%
10%
1%
Organic impurities present in waste water
Pesticides
Nitrates
Phosphates
Metals
Which natural process continuously converts some of the saline sea water into freshwater?
Evaporation
Transpiration
Infiltration
Water cycle
What percentage of the earth's surface is covered with water?
about 51%
about 21%
about 71%
about 81%
The total water:
in the lakes and rivers of the world remains constant
under the ground remains constant
in the seas and oceans of the world remains constant
of the world remains constant
Plants use this gas during respiration
nitrogen
carbondioxide
oxygen
all the above
The water - bearing layer of the earth is called
conifer
hydrosphere
aquifer
water table
Roots respire through
Spiracles
Lenticels
Stomata
Air spaces
The process of water seepage into the ground is called
evaporation
infiltration
precipitation
Chemical used to disinfect water.
Oxygen
Chlorine
Fluorine
Nitrogen
