1. The approximate equatorial circumference of the earth is 40000 km.
2. Spring tides occur on new moon and full moon days because on these days sun, moon and earth are in the straight line.
3. The International Date Line is an imaginary line extending from pole to pole along the places on the earth’s surface and lies along the 180-degree meridian.
4. The total surface area of earth is 510 million square kilometers.
5. The upper part of the mantle upon which the crust of the Earth floats is called Asthenosphere.

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