1) The spinning of the earth around its own axis is known as ____. 2) The imaginary line around which earth rotates is called ____. 3) Define the term Revolution of the Earth.  4) Earth takes ___ hrs to complete one rotation. 5) To complete revolution , the earth take _____ days. 6) Effects of Rotation of the Earth 7) Effects of revolution of the Earth 8) Why leap year occurs after every 4 years.

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