if it is 20. Normally, a parcel of air warmer than the surrounding air; converse

Question

if it is 20. Normally, a parcel of air warmer than the surrounding air; conversely, the air parcel will surrounding air if it is cooler than the remains stationary, sinks b. a. rises, remains stationary sinks, rise rises, sink c. d. 21. Microscopic particles, such as dust particles and sea salt crystals, are known as as "landing pads" on which water vapor can condense that serve ice cyrstals b. a. condensation nuclei supercooled water droplets d. c. water droplets 22. Tiny particles present in the atmosphere so small and light that the slightest movements of air keep then aloft are called Eg soot, salt particles a. clouds b. aerosols c. cirmuS d. convection 23. Absorption and downward movement of precipitation into the soil is called a. infiltration b. runoff c. snowfall d. evaporation 24. The realm of water in all its forms, and the flows of water among ocean land and atmosphere are known collectively as a. Hydrosphere b. Lithosphere C. Biosphere 25. Motion of a surface layer ground surface when the infiltration rate is exceeded by the precipitation rate; a form of run off of water over a sloping a. Snowfall b. Evaporation c. Overland flow d. Infiltration

Explanation / Answer

Ans 20. Normally, a parcel of air rises if it is warmer than the surrounding air; conversely the air parcel will sink if it is cooler than the surrounding air. (Explanation - When a air parcel have more temperature than surrounding its density is lesser than surrounding, so due to bouyancy it rises up. The reverse happens when the air parcel is cooler, it is more denser than the surrounding and so sinks )

Ans 21. Microscopic particles such as dust particles and sea salt crystals are known as condensation nuclei that serve as "landing pads" on which water vapour can condense. (Explanation : Water in vapour form needs a non-gaseous material surface to change its state from vapour to liquid. These small particles present in cloud helps them to condense.)

Ans 22.Tiny particles present in the atmosphere so small and light that slightest movement of air keep them aloft are called aerosols. Ex. soot, salt particles

Ans 23. Absorption and downward movement of precipitaion into the soil is called infiltration. (Explanation : When the soil and rock bodies below the soil layer are unsaturated with respect to water, there remains many empty pore spaces and the rain water is first absorbed by soil and then that water trickles down due to effect of gravity downwards. This process is known as infiltration).

Ans 24. The realm of water in all its forms, and the flows of water among ocean,land and atmosphere are known collectively as Hydrosphere. (Explanation - Different spheres have been subdivided within the earth to efficiently study the particular system like hydrosphere,atmosphere etc. The water moves to different domains of earth like below the soil surface and it also goes to the atmosphere in the form of vapour. This flow of wate is called water cycle and this cycle makes the system called hydrosphere).

Ans 25. Overland Flow    (Explanation - When the rain water falls on such area where the soil and subsurface is saturated with respect to water because the precipitaion rate is more than infiltration rate, none of the pore spaces remains empty to accomodate more water. Then the falling rainwater then have to flow over the surface to topographic lows which is called as surface runoff or Overland flow).

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