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How do earths magnetic field magnetize an iron bar over many years?
Helloskyler
Ferromagnetic materials are randomly distributed, but in a magnetic field, they can become aligned
in the direction of the magnetic field. The earth's magnetic field has a fairly stable direction over very long time periods (many thousands of years). :D hope u injoy
Wiki User
∙ 11y ago
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Minerals in igneous rocks can show the direction of earths?
The Earth magnetic field changes approximately every 200,000 thousand years.
Earths magnetic poles reverse approximately every years?
The process of the reversal of the Earth's magnetic poles is called a magnetic flip. This occurs every 4 or 5 times per million years.
Why are there magnetic strips on the ocean floor what do they mean?
The earth maintains a magnetic field due to the metals that make up its core. Thus, all rocks are influenced by this magnetic field and "face" the direction the field is "facing". Every few hundred million years the poles switch, and with it the magnetic field. Similarly, all rocks "face" the new direction. Magnetic strips are indicators of when the magnetic field of the Earth changed.
What is the definition of magnetic reversal?
The revels of the Earths magnet poles that has occurred at Irregular intervals averaging approximately one millions years.
What do the earths magnetic poles move around?
This happens about once every 50 to 100 thousand years and is called a magnetic reversal.It would appear that the self generated magnetic fields formed by rotating bodies all undergo pole reversals. For instance the Sun does this about every 11 years.
How could earths magnetic field magnetize an iron bar over years?
I see where you're going, and it is feasible, but any magnetic charges that develop in it would be veryextremely minute (meaning very little). But to answer your question, Earth can magnetize an iron bar because the poles in iron are scattered in different directions, and as it's just laying there, they naturally align with Earth's magnetic field. It's hard to explain, because magnetism is such an abstract force, but all I can say is that it naturally happens.
Why do scientists think that earths' magnetic field has not always pointed north?
Every 100,000 years or so, the Earths magnetic field shifts direction. North becomes south, south becomes north.
About how long ago was the last time earths magnetic field reversed?
About 41,000 years ago.
Minerals in igneous rocks can show the direction of earths?
The Earth magnetic field changes approximately every 200,000 thousand years.
How long ago did the earths magnetic field reverse itself?
The last time that Earth's magnetic field reversed itself was 780,000 years ago. See the related link for two timelines showing geomagnetic reversals in Earth's history.
About how often do earths magnetic poles?
every 250,000 years :)
About how do earths magnetic poles reverse?
every 250,000 years :)
Earths magnetic poles reverse approximately every how many years?
250,000 years
Is Earths magnetic field widening?
I am not sure what you mean by widening. The Earth's magnetic field is a result of the fact that the Earth has a molten Iron core and the planet is rotating quite rapidly. The strength of the magnetic field in these circumstances is dependent on the speed of rotation. As the Earths rotational speed is slowing (due to the friction of the tides caused by the moon) the Earth's magnetic field is gradually weakening over geological time scales but this is not significant in terms of human time. The other affect of the rotating Iron core on the magnetic field is what is called field inversions. In the same was as the Sun goes through an 11 cycle of activity during which the N and S magnetic poles flip, the Earth's poles also flip about once every 75-100 thousand years. There is some evidence that the Earth's poles are in the process of flipping at the moment and during this process, in the same was that the Sun develops Sun spots, multiple poles appear at various locations round the Earth. This effect could be said to distort (or widen) the Earths magnetic field.
What is the link with the northern lights and a compass?
The formal term for the "northern lights" is "Aurora Borealis". To answer your question, the light show happens when a solar flare hits Earths MAGNETIC field. Without Earths magnetic field, there would be no northern light, nor would compasses be at all useful- THAT is how they are linked. God, I'm such a nerd. Would you believe I'm only 12 years old?
How old is the magnetic field?
The Sun is 4.5 billion years old and as everything has a magnetic field it stands to reason that it also is 4.5 billion years old.
About how often do earths magnetic poles reverse?
Every 250,000 years, when it farts
