3. (a)How is dew formed? What is the difference between fog and mist?
(b)Describe briefly the orographic and convectional rainfall.
(c)Give a geographical reason for each of the following:
(i) A rain shadow area is generally dry.
(ii) Frontal rain is common in mid-latitudes.
(iii) Convectional rainfall is called 4 o'clock rainfall.
(d)Define precipitation. Explain briefly the three forms of precipitation.
Answers
Answer:
Dew is deposit of water drops that is formed on cold surfaces by condensation of water vapors in the air. ...
Fog is a cloud that appears near the ground or touches the ground. Mist is a thin fog that appears near the ground.
Convectional rainfall. When the land warms up, it heats the air above it. ... As the air rises it cools and condenses. Orographic precipitation, rain, snow, or other precipitation produced when moist air is lifted as it moves over a mountain range.
!.A rain shadow area is an area of dry land that lies on the leeward(or downwind) side of a mountain. High mountains act as barriers for cold or hot winds; they may also cause precipitation if they are high enough and lie in the path of rain-bearing winds. The leeward side of the mountains remains dry.
!!.Frontal rain is common in the areas where mid- latitudes lies due to the meeting of the sub- tropical and polar air masses. ... The area in mid- latitude experiences a frontal or depressed rainfall. The colder and denser mass of air is pushed down by the warm and moist air mass by cooling
!!!.Convectional rainfall is also called 4 o 'clock rain: Convectional rainfall is the result of high rate of evaporation. Then condensation takes place and rain falls. At mid day , when the sun is at the highest position, the temperatures rise at the equator. This increases the evaporation rate
!!!!.different types of precipitation —rain, snow, hail, and sleet for example—yet they all have a few things in common. They all come from clouds. They are all forms of water that fall from the sky.