Answer: Option A. -> True
:
A
The amount of usable water on earth is limited as not all sources of water give usable water. Water present in oceans is too salty, much of the water is frozen in form of mountainous and polar glaciers. So, only a small portion is available for use.

Answer: Option A. -> True
:
A
Rainwaterharvestingis a technique of collection and storage ofrainwater for future use. The rain water which is harvested is helpful in recharging the groundwater level.

Answer: Option C. -> A – Evaporation, B – Condensation, C – Precipitation
:
C
Given picture represents water cycle in the environment. It is clear from the picture that the water is getting evaporated due to sunlight and when the water vapour rises up, it condenses and form clouds, which later results in rainfall.

Answer: Option B. -> Amount of infiltration > Amount of ground water used
:
B
If the amount of water that is fed underground is more than the usage, it will lead to an increase in the groundwater level. This is achieved by taking steps like reduction of unnecessary water, keeping check on the usage of water by industries, prohibiting the release of effluents and toxic chemicals in water, etc.

Answer: Option A. -> ocean, land
:
A
The circulation of water between ocean and land is known as the water cycle. The energy required for thisprocess is provided primarily by the sun. Evaporation and condensation of water plays an important role in water cycle.

Answer: Option A. -> True
:
A
When water vapour present in the atmosphere comes in contact with the surface of a cold water glass, the vapour loses heat and condensation happens. Rainfall also happens due to condensation of water followed by precipitation. Hence, the given statement is true.

Answer: Option B. -> Saline water > Frozen water > Usable surface water
:
B
Since oceans (which is saline in nature) are the biggest reservoir of water, containing about97% of all the water present on the earth, these arethe most availableform of water on the earth. The second source of water, i.e., frozen water or ice is found on poles and mountains. The ice melts and feeds all the rivers which representthe usable surface water. Hence, the correct order isSaline water > Frozen water > Usable surface water

Answer: Option C. -> Collisions of celestial bodies with the earth.
:
C
Both comets and asteroids can contain ice. Some scientists suspect that such bodies could easily have delivered water leading to the formation of oceans.
Other scientists believe that meteoroids hit the Earth and led to the origin of water.

Answer: Option C. -> evaporation and transpiration
:
C
Water vapourenters the atmosphere due to evaporation from water bodies like lakes, oceans, rivers, transpiration from plants, etc. Transpiration is itself a special kind of evaporation which happens through the pores of plant leaves.

Answer: Option B. -> False
:
B
The given statement is false. Water (moisture) present in the soil also evaporates. This is the reason why wet mud turns dry after sometime.