Q. 34.2( 6 Votes )

Define the following:

1. Unique planet 4. Continents

2. Size of the Earth 5. Prime Meridian

3. Geoid 6. Indian Standard Time

Answer :

1. Unique planet – The Earth has been described as the ‘Unique planet’ or the ‘Living planet’ due to its life supporting features such as its appropriate location from the Sun, the presence of life supporting gases and the water cycle.

2. Size of the Earth – The Earth is the fifth largest planet in the Sun’s family with a diameter approximately 4 times greater than the Moon, being around 107 times less than that of the Sun.


3. Geoid – Geoid refers to the shape of the Earth, literally meaning Earth shaped or Oblate spheroid. The measurement of the Equatorial and the Polar diameter and the Equatorial and the Polar circumferences, accompanied by the difference between the diameters is the proof for the Geoid shape of the Earth.


4. Continents – The land bodies of the Earth are known as Continents. These are land masses of large size, comprising of seven continents in all. The seven continents are – Asia, Europe, Africa, North America, South America, Antarctica, and Australia. Among these, Asia is the largest continent whereas Australia is the smallest continent.


5. Prime Meridian – The Meridian (longitude) passing through Greenwich (England) has been chosen as the Prime Meridian which serves as the primary factor dividing Eastern and Western Hemisphere.


6. Indian Standard Time – The Standard Time refers to the uniform time based on the central meridian of a country or the meridian on which the most important city is located. In India, 82 1/2 degree East longitude is considered as the Standard Meridian of the country. It passes through Allahabad of Uttar Pradesh and the time based on this meridian is called the Indian Standard Time (IST). Indian standard time is 5 and half hour ahead of coordinated universal time (UTC).


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