Gujarat BoardEnglish MediumSTD 9Social ScienceClimate3 Marks
Question
Why do the seasonal changes occur?
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Answer
The earth revolves around the sun keeping its axis inclined at an angle of $66.5^o.$
The northern and southern hemispheres remain inclined towards the sun alternatively during the year.
The sunrays fall vertical over the hemisphere which is inclined towards the sun. Vertical sun-rays give more heat. Days are also longer. Sc it is summer there.
The sunrays are slant over the hemisphere which is inclined in the other direction of the sun. Slant sunrays give less heat. Here the nights are longer and the days are shorter. So it is winter there.
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