WHY DOESN'T THE EARH'S ROTATION HURL US OFF THE SURFACE OF THE PLANET?

WELl you know guys.... this question got in to my mind when i was in 7th class...... :P  it seems strange but when i asked someone i know who are elder to me they haven't answered to me .....

it's quite simple.... of course i would go somewhat logic wise.. 

               

                    The earth rotates very rapidly, it's speed at the equator being almost 1700 km/h. To keep all of the inhabitants of the earth firmly on the ground and rotating along with the planet,requires the gravitational pull of the earth's immense mass. It is "GRAVITY" that keeps our feet on the ground.In fact, there is a reduction in weight due to rotational speed that means we weigh around 0.5% more at North & South poles than we do at the Equator.If there was a planet that actually rotated so fast that it was impossible for it's inhabitants to be held down by gravity if they stood at it's equator, the planet itself would fly apart.

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