In what earth layer does out magnetic field originate?

Answer 1

Magnetic declination changes over time because themagnetic poles move slowly, between 1580 and 1820, for example the direction of magnetic north in London changed by 35 degrees Written by Londyn reid 13 yrs old

Answer 2

1. Magnetometers detect minute deviations in the Earth's magnetic field caused by iron artifacts, kilns, some types of stone structures, and even ditches and middens in archaeological geophysics..
2. There is no clear theory as to how the geomagnetic reversals might have occurred. Some scientists have produced models for the core of the Earth wherein the magnetic field is only quasi-stable and the poles can spontaneously migrate from one orientation to the other over the course of a few hundred to a few thousand years. Other scientists propose that the geodynamo first turns itself off, either spontaneously or through some external action like a comet impact, and then restarts itself with the magnetic "North" pole pointing either North or South. External events are not likely to be routine causes of magnetic field reversals due to the lack of a correlation between the age of impact craters and the timing of reversals. Regardless of the cause, when magnetic "North" reappears in the opposite direction this is a reversal, whereas turning off and returning in the same direction is called a geomagnetic excursion.

Source Wikipedia

Humera Kaleem

Saudi Arabia

Answer 3

The magnetic field of the earth is everywhere. Well, it's not everywhere! The magnetic field is surrounding the entire earth. It's like if you placed two magnets together with opposite poles touching and sprinkled iron filings on it. All the filings would line up in a semicircle around the magnets and lead from positive to negative. except in the earths case the field would be 3-dimensional. Also, the field gets weaker as you move away from the planet. I hope I helped.

Answer 4

The Earth's magnetic field is the result of a dynamo. Put simply, the stuff under the earth's crust (especially the earth's molten core of iron) is rotating, convecting (hot stuff rises, cooler stuff sinks), and is electrically conductive. Because of all of this, the earth's interior acts sort of like an electrical generator, creating a huge magnetic field.

Additionally, the rocks of the crust are magnetised in the same direction as the earth's magnetic field and contribute to the effect.

Previous answer (cute, but seriously folks):

Barnstable, England.

The previous answer is mostly correct, but the Earth's core is not molten. It is pretty much solid iron. Mixed with a little nickel and other elements. But it is solid. It is the act of this solid core rotating through the molten upper layer that generates the magnetic field. The core periodically changes the direction of its rotation, which accounts for the magnetic stripes in the Atlantic Ocean floor near the mid atlantic trench. Molten rock rises from the trench, then orients itself in the direction of the Earth's magnetic field, then solidifies. Every time the magnetic poles switch, the orientation of the new molten rock changes direction. Thus, we can tell how often the poles switch direction.

To clarify a little, the Earth's core is solid at the center but molten toward the outside. The mostly iron core is hot enough to be molten throughout, but the intense pressure exerted on the inner core by all the rest of the Earth pushing down on it is so great that it forces the inner core to stay solid even though it's hot enough to melt at normal pressure.

By the way, the Earth's magnetic field change polarity randomly, but usually on a scale of hundreds of thousands to millions of years. That is, it tends to maintain its polarity for a long, long time.

Answer 5

I dont know about it but it saves some what from strorm from Sun. It is made from inside Earth from a molton mars which has high heat which use to make direction like east, north etc. Our magnetic field is smaller in size but other gaseous planets has very big magenetic field.

Answer 6

The simple question "how does the Earth get its magnetic field?" does not have a simple answer. It does seem clear that the generation of the magnetic field is linked to the rotation of the earth, since Venus with a similar iron-core composition but a 243 Earth-day rotation period does not have a measurable magnetic field. It certainly seems plausible that it depends upon the rotation of the fluid metallic iron which makes up a large portion of the interior, and the rotating conductor model leads to the term "dynamo effect" or "geodynamo", evoking the image of an electric generator.

Answer 7

they deflect solar energetic particles caused by coronal mass ejections from our sun (deflect harmful rays of sunlight)

Answer 8

It changes through direction and strength. Direction changes overtime so Magnetic North becomes Magnetic South.

Answer 9

The magnetic field in the Earth originates in the Core.

Answer 10

Birds and navi-computers use the Earth's EM Field to navigate. The EM Field also protects the planet from the Sun's deadly solar radiation.