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Hundreds of times, but not recently. As in, not in the last 20,000 years or more. Magnetic polarity reversals happen at fairly regular intervals, and it is possible that another will occur within the next few hundred years. But as yet, there's no sign that one is imminent.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoYes both in direction and magnitude. But rather slowly.
The angle of the Earth's tilt is relatively stable over long periods of time. However, the tilt does undergo a slight, irregular motion (known as nutation) with a main period of 18.6 years. The orientation (rather than the angle) of the Earth's axis also changes over time, precessing around in a complete circle over each 25,800 year cycle; this precession is the reason for the difference between a sidereal year and a tropical year. Both of these motions are caused by the varying attraction of the Sun and Moon on the Earth's equatorial bulge.
Wiki User
∙ 14y agoplease sum1 help i need to know the answer to this question quick its 4 home work
Wiki User
∙ 14y agoIndeed it has. North and South Magnetic Poles have swapped places on several occasions.
Wiki User
∙ 14y agoYes. The Earth's rotation is slowing down. A tiny bit. A fraction of a whisker. You'll never notice it. But in a few million years or so, the day will be an hour or so longer than it is now.
Wiki User
∙ 14y agoWhatever they are, that's what they are.
By whose standards should we conclude that they violate laws of nature and are messed up ?
Wiki User
∙ 17y agoMany researchers claim that they are, and that they have periodically done so since the beginning of the planet.
Wiki User
∙ 15y agoYes. The field has moved and flipped.
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How is earths magnetic field used by people and animals?
the earths magnetic signature is a negative polarity signature
How is the force affected when the current is reversed in a magnetic field?
The magnetic field would reverse.
Why are magnet patterns important evidence for plate tectonics?
magnetic rocks on the ocean floor show that the Earths magnetic field has been frequently reversed forming new sea floor.
When new basalt forms along mid-ocean ridges it become magnetized?
accorsing to the earths magnetic field
Is Earth's current polarity normal or reversed?
It was reversed 65 million years ago. This is an approximate answer.
How is earths magnetic field used by people and animals?
the earths magnetic signature is a negative polarity signature
Does the earths magnetic field has periodically reversed direction?
Yes. In historical times , clay pots have shown that the earth's magnetic field has reversed.
When the Earth's polarity is reversed is the Coriolis effect also reversed?
No. The reversal of polarity is a reversal of Earth's magnetic poles. The Corilolis effect is a direct consequence of Earth's rotation and is not affected by the magnetic field.
About how long ago was the last time earths magnetic field reversed?
About 41,000 years ago.
Will the polarity of the earths magnetic field change in 2012?
There is no reason to believe that the Earth's magnetic field will change any time soon... or, for that matter, that anything extraordinary is going to happen in 2012.
How is the polarity of Earth's magnetic field recorded in the sea floor?
The polarity of the Earth's magnetic field is recorded in igneous rocks, and reversals.
Describe how the polarity of earth's magnetic field is recorded in the sea-floor?
The polarity of the Earth's magnetic field is recorded in igneous rocks, and reversals.
Can the magnetic field of Earth be reversed How?
No
What would happen if the direction of the current through a hall probe is reversed?
The idea is that the magnetic field of the device reacts with the external magnetic field. If the current is reversed, the magnetic field would also be reversed, and the reading would be the opposite.
The alignment of iron-bearing minerals in rocks when they formed reflections the fact that earths has reversed itself several times in its past?
magnetic field .
How is the force affected when the current is reversed in a magnetic field?
The magnetic field would reverse.
Why is it believed that the Earth's magnetic field has reversed its polarity in the past?
By observing magnetic rocks in geological deposits.By observing magnetic rocks in geological deposits.By observing magnetic rocks in geological deposits.By observing magnetic rocks in geological deposits.
