D. Answer the following questions in brief.
1. Which two basic points on the earth serve as the reference points?
2. Mention the latitudinal location of the heat zones of the earth.
3. Why does the Torrid zone have the maximum temperature?
4. What is the significance of Greenwich Mean Time?
5. Why is the Standard Meridian selected by a country a multiple of 7.5°?.
Answers
Answer 2. ) = ☝️☝️
Answer 1 .) = The earth being spherical in shape has no edges or corners which can be used as reference points in locating the places. However, the end points of the imaginary axis of the earth on which it rotates, provide us two basic points of reference. These end points of the earth's axis are called North Pole and South Pole.
Answer 3. ) = The mid-day sun directly faces the area between the Tropics of Cancer and Capricorn. So the heat received is maximum at these latitudes. These latitudes fall under the Torrid Zone. That's why , Torrid zone have the maximum temperature .
Answer 4. ) = As the reference for GMT, the Prime Meridian at Greenwich therefore became the centre of world time and the basis for the global system of time zones. ... It was recommended that the meridian line would indicate 0° longitude. Therefore this also became the start of the Universal Day.
Answer 5. ) = The time kept at any place is denoted with reference to time at prime meridian (GMT or UT). Longitude of prime meridian is 0. All meridian east of prime meridian is called east longitude and west is called west longitude. Earth is divided in 180 degree east and 180 degree west. Total 360 . Each standard day is 24 hours. Dividing 360 by 24 is 15. Hence the standard time at any place can be found by dividing the longitude by 15. + For east and - for west. Each country chooses a suitable longitude and get it's standard time as per above. To be more accurate, it is divided by 7.5 to give standard time in half an hour interval.
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