Question

8. What kind of movement does the earth have about its axis?
9. An object moves to-and-fro about its position of rest. What type of motion is this?
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Answer 1

Answer:

8. rotation 9. it is said to be in vibration

Answer 2

Explanation:

8 .Imagine a line passing through the center of Earth that goes through both the North Pole and the South Pole. This imaginary line is called an axis. Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth's rotation. At the same time that the Earth spins on its axis, it also orbits, or revolves around the Sun. This movement is called revolution.

9.In periodic motion, an object moves to and fro about its position of rest.