Conservation of angular momentum.
Imagine the event of the creation of the earth out of a layer of rocks and metals in the Solar Nebula. As the Earth was clumping together, each individual chunk that would eventually form Earth would have motion of some sort. All these motions, if seen as relative to the centre of gravity of primordial Earth would have resulted in a single common sort of angular vector when all the clumps would eventually be brought together.
As the clumps merged, the "body" of clumps contracted and by the principles of conservation of angular momentum (which dictate that the rate of rotation of any body will increase as it contracts - think spinning around and folding in your arms to make you spin much more quickly), any original common angular momentum would have been greatly exagerrated into a more powerful common rotational period for all of Earth; hence our spin.
2006-08-21 16:14:44
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answer #1
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answered by Steven X 2
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Nothing in the universe is stationary.
Stationary is an Earthly experience where your TV stands in the corner and doesn't move (when in fact it does move with the Earth's travels in space).
You cannot think terrestrial when looking into space. That is why people have got hung up on the moon landings supposed hoax - they can't get their silly heads around the vast differences experienced on the moon when considering light, gravity, airlessness, etc.
So, it would be a better question if the Earth didn't revolve on its axis - you would ask why it doesn't when every other body does revolve in some way.
But that's superfluous because in the concept of the cosmos, everything moves in relation to everything else, and all bodies rotate or revolve, even galaxies.
2006-08-21 23:53:47
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answer #2
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answered by nick s 6
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The earth and all other matter in the solar system evolved from a gas and dust cloud.
Contrary to popular notion, an object drifting in free space will most probably spin than to move straight. For example, if you can throw a spanner out into deep space from your spacecraft, the spanner will most probably spin away from you, instead of moving off in a stiff posture. This is because the forces that acted on both ends of the spanner were unequal when you threw it out.
Likewise, when the swirling cloud of dusts condenses into planets and asteriod, every solid object in the cloud is made to spin. This effect is increased by the bombardment of the objects by other objects through collision.
Hence, the planets will spin.
2006-08-22 12:15:29
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answer #3
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answered by Street Smart 4
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because of the moon and other planets (Saturn). As the moon is moving away from the earth the axis is loosing. That's why the natural disasters are getting worst by the year. Eventually the moon will be to far away, the earth will be out of axis and flooded.
2006-08-21 23:52:32
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answer #4
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answered by Anonymous
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Earth, as all planets, spins around its axis that is how we have day and night. This is due to the way planets are formed. Thy whole solar system, as many star systems, came about from a rotating hydrogen cloud rotating and collapsing on its own mass. this rotation is still carried today by all the bodies in the Solar system at one form or another.
2006-08-21 23:16:36
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answer #5
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answered by Pyramider 3
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The earth doesn't REVOLVE on it's axis but it SPINS around it's axis!!
2006-08-21 23:12:51
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answer #6
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answered by æ^_^æ 2
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b/c the planet rotates on the equatorial plane which is 23.5° on an ellipse due to the mangnetic poles and force of gravity from the sun. the geograpical poles make it therefore seem tilted, but the magnetic poles are really where its "straight".
2006-08-22 00:41:41
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answer #7
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answered by wing_gundam 3
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simple there is no interference occured thats why for that matter there is no disturbance thats why..... did u gotcha
2006-08-22 01:36:03
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answer #8
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answered by maddy 2
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Cause God made it that way! Silly, don't you know?
2006-08-21 23:38:43
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answer #9
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answered by Cabana C 4
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Bcoz it belongs to......
her!
2006-08-22 16:05:33
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answer #10
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answered by gaurav 1
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