ENERGY FROM THE SUN

Main Points :

• The sun is the prinicpal source of energy.
• The energy constantly emitted by the sun is known as solar radiation.
• The solar radiation received on the surface of the Earth is called ‘Insolation’
• Plants and animals depend upon heat and water.
• We also receive many other forms of energy from the sun like UV rays, radio waves, X rays.
• 1/3rd of solar energy is reflected back by the Earth’s atmosphere.
• The sun rays fall at about 90^0 on the Equator and fall slantingly towards the poles. This is called “Angle of Incidence”.
• Land is considered as “Good conductor of heat. While Land gets heated and cooled quickly. Oceans will take heat and cool.
• Carbon dioxide prevents raditaton of heat from the Earth.
• Carbon dioxide in the atmosphere increases due to heay utilisation of defores- tation etc…
• If co2 increases, less heat will be radiated which causes ‘ Global warming’.
  Temperature is measured by Thermometer.
• The Lowest temperature is recorded in Antarctica, i.e. – 89.2 celsius. (Vostok)
• The Highest temperature is recorded in Azizia in Libya (Africa) i.e. 57.80c
• Boiling point of temperature is around 1000c
• Freezing point of temperature is 00c.
• The temperature cannot go below – 273.160c.
• The climate in Hyderabad will be extreme climate as it is far away from the sea.
• Temperature decreases with elevation (height).
• Delhi is at an elevation of about 200 metres above from the sea level.
• Shimla is at an elevation of about 2276 metres above from sea level.
• So, temperature in shimla is lower than that of Delhi. So, Shimla is cooler than Delhi.
• Usually for every 1000 metres increase in elevation, the temperature falls by about 60c.
• Nigeria is situated on the Equator.
• Indonesia is located in Equatorial region.
• There is no winter season in Indonesia.
• The places near the equator, usually get more heat.
• The sun rises first in Arunachal Pradesh in our country.
• The Sun set last in Gujarath
• Japan is called as the ‘Land of rising sun’ (Nippon).
• ‘ Norway is called as ‘ Land of Midnight sun’
• We can grow fruits & vegetables in cold regions by building Green – houses.
• Temperature difference between places causes winds & rains

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