(i) Solve this crossword puzzle with the help of given clues.
Across:
6. An Indian tree having extraordinary quality of providing oxygen round the clock
8. Gas present in atmosphere occupying only 0.03% by volume
11. Outermost layer of atmosphere
12. Mixture of many gases
14. Life giving gas
15. Air in motion: Wind
16. An Indian tree valued highly for medicinal properties
18. Gas protecting us from harmful sunrays
19. Low pressure area
Down:
1. Amount of water vapour in air
2. Condensation of water vapour around dust particles in atmosphere
3. Example of local wind blowing in summer in northern India
4. Short term changes in atmosphere
5. Precipitation in liquid form
7. Blanket of air around the earth
9. Instrument to measure pressure
10. Incoming solar radiation
13. Reduces visibility in winters
17. It is-------time when sun is overhead.
(ii) Make a weather calendar for one week. Use pictures or symbols to show different types of weather. You can use more than one symbol in a day, if the weather changes.
(i)
Across:
6. An Indian tree having extraordinary quality of providing oxygen round the clock: Peepal
8. Gas present in atmosphere occupying only 0.03% by volume: Carbon dioxide
11. Outermost layer of atmosphere: Exosphere
12. Mixture of many gases: Air
14. Life giving gas: Oxygen
15. Air in motion: Wind
16. An Indian tree valued highly for medicinal properties: Neem
18. Gas protecting us from harmful sunrays: Ozone
19. Low pressure area: Cyclone
Down:
1. Amount of water vapour in air: Humidity
2. Condensation of water vapour around dust particles in atmosphere: Cloud
3. Example of local wind blowing in summer in northern India: Loo
4. Short term changes in atmosphere: Weather
5. Precipitation in liquid form: Rain
7. Blanket of air around the earth: Atmosphere
9. Instrument to measure pressure: Barometre
10. Incoming solar radiation: Insolation
13. Reduces visibility in winters: Fog
17. It is noon time when sun is overhead.
(ii)
Give reasons.
(ii) Amount of insolation decreases from equator towards poles.
(i) Water from wet clothes evaporates due to the presence of sun and wind. The rate of evaporation is much slower on a humid day than that on a dry day.This is because the air already has some amount of moisture present in it. Hence, it takes longer to dry wet clothes.
(ii) Sunlight falls almost vertically on the equator, while it falls at a slanting angle on the poles. Therefore,the amount of insolation decreases from equator towards the poles. The amount of insolation received by the equatorial regions is greater than that received by the polar regions.
Match the following.
(i) Trade winds (a) Incoming solar energy
(ii) Loo (b) Seasonal wind
(iii) Monsoon (c) Horizontal movement of air
(iv) Wind (d) Layer of ozone gas
(e) Permanent wind
(f) Local wind
(i) Trade winds (e) Permanent wind
(ii) Loo (f) Local wind
(iii) Monsoon (b) Seasonal wind
(iv) Wind (c) Horizontal movement of air
(i) Which of the following gases protect us from harmful sun rays?
(a) Carbon dioxide (b) Nitrogen (c) Ozone
(ii) The most important layer of the atmosphere is:
(a) Troposphere (b) Thermosphere (c) Mesosphere
(iii) Which of the following layers of the atmosphere is free from clouds?
(a) Troposphere (b) Stratosphere (c) Mesosphere
(iv) As we go up the layers of the atmosphere, the pressure:
(a) Increases (b) Decreases (c) Remains the same
(v) When precipitation comes down to the earth in the liquid form, it is called:
(a) Cloud (b) Rain (c) Snow
(i) (c) Ozone ✓
(ii) (a) Troposphere ✓
(iii) (b) Stratosphere ✓
(iv) (b) Decreases ✓
(v) (b) Rain ✓
Answer the following questions.
(i) What is atmosphere?
(ii) Which two gases make the bulk of the atmosphere?
(iii) Which gas creates green house effect in the atmosphere?
(iv) What is weather?
(v) Name three types of rainfall?
(vi) What is air pressure?
(i) The huge blanket of air that surrounds the earth is known as atmosphere.
(ii) The gases which make the bulk of atmosphere are nitrogen and oxygen.
(iii) Carbon dioxide creates green house effect in the atmosphere.
(iv) The state of atmosphere at a particular place and time is known as weather. It is the hour-to-hour, day to day condition of the atmosphere.
(v) Three types of rainfall are:
(a) The Convectional Rainfall
(b) The Relief or Orographic Rainfall, and
(c) The Cyclonic Rainfall
(vi) The pressure exerted by the weight of air on the earth’s surface is known as air pressure.
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