7. Which one of the following is the main reason why the Earth has seasons? (a)

Question

7. Which one of the following is the main reason why the Earth has seasons? (a) Earth's orbit is elliptical. We have summer when we are closer to the Sun and winter when we are farther from the Sun. (b) The tilt of Earth's axis of rotation causes one hemisphere of the planet to be substantially closer to the Sun during the day than the other hemisphere. Because it is closer to the Sun, it receives more solar energy per hour. (c) Over the course of the year, the tilt of Earth's axis varies from 23.5° to 0° in such a way as to bring more heating per hour in the summer than in the winter. (d) The tilt of Earth's axis of rotation causes the Sun to pass higher in the sky during the day in one hemisphere than in the other, thereby giving more daylight hours and more heating per hour. (e) It has seasons so that sunbathers will know when to go to the beach, and skiers will know when to go skiing.

Explanation / Answer

Q.7)  Which one of the following is the main reason why the Earth has seasons?

Ans. (d) The tilt of Earth's axis of rotation causes the Sun to pass higher in the sky during the day in one hemisphere than in the other, thereby giving more daylight hours and more heating per hour.

The main reason of season is the variation of amoun of incoming solar radiation through out the year. The atmosphere is not directly heated by the solar insolation. The insolatio is absorbed by the Earths surface then it heats the atmosphere by different process. Earth is also radiates heat to the space at the night time. By this process Earths surface is heated in the day time and heat is released at the night time and the temperature is balanced.

So, if the length of day is greater than the length of night then the amount of incoming solar radiation is greater than the heat radiates by the Earth. The overall temperature increase and the season becomes warmer gradually. In the other hand, if the length of night is greater than the length of day then the heat radiates by the Earth get icreased. So the overall temperature decrease and the season becomes colder gradually.

This is the main reason why the Earth has seasons.

Thats all

Thank you.

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