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Along the ocean ridges, as they spread and make new ocean floor, the minerals that can become magnetized point to the positive north pole. In past eons, the magnetized metals have pointed in the opposite direction.
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoThe Earth's magnetic field is the sum of several electric currents circulating in the magma. These arise according to the local conditions, and vary with time.
The magnetic field has reversed many times in the past, and will continue to do so.
The magnetic field protects the bulk of the Earth's surface from bombardment by charged particles from the Sun. This protection also probably helps Earth retain some of its atmosphere against the erosive effects of the Solar Wind. But the effect of this on living forms seems slight in the geological record. But could be disastrous in the short term.
It is possible that the loss of atmosphere on Mars is due to its magma cooling, and the subsequent loss of a protecting magnetic field.
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The magnetic particles in seafloor ridges are aligned differently in a repeating pattern How does this provide evidence for tectonic movement Why does it provide evidence?
Earth's magnetic field reverses over time; the changes show that seafloor has taken place over time.
What magnetic qualities does earth process?
Electric currents circulate in the interior of the Earth, and these create an magnetic field, with a north pole and a south pole. But not necessarily aligned with the geographic (spin) poles. If a rock which contains ferric particles is cooling, then those ferric domains will assume the direction of the Earth's magnetic field at the time the parent rock passed through that minerals Curie point. It will contain some 'fossil' magnetism.
Of True North and Magnetic North and Compass North which way is really up?
True North is the real North, following along the lines of longitude which converge at the North Pole, the farthest geographically North point on the planet, and the rotational axis of the planet. Magnetic North and Compass North are both the same thing, with the compass pointing along Magnetic North. Magnetic North however, is not the real North. If you were to follow your compass as far North as it could point, you would end up on the Prince of Wales Island in the Northwest Territories of Canada, over 1,500 miles away from the North Pole. Magnetic North can be adjusted to True North on your compass by knowing the local magnetic variation of your area and adding/subtracting accordingly. A third North is Grid North, which follows the Grid Lines on a standard map. At the South Pole, every direction is True North, so Grid North is used instead and can be found by following the Prime Meridian northwards. Hope that helps.
Is the earth's magnetic field always the same?
The earth's magnetic field is present because of the molten iron in its core. Always a little change keeps on occurring in the earth's magnetic field. Although the change is very little with respect to time,but it is considered one of the major factors for the end of this world.
How did georgia O'keeffe's style change over time?
Georgia changed.....
Reasons for Earth magnetic north poles being mapped and why they need to be kept up to date is?
There are no "magnetic north poles", only one. (There is also a magnetic south pole.)The reason is that the magnetic poles change over time.
What is it called when rocks are different because Earths magnetic poles change places?
Magnetic Reversal. Several magnetic reversals have occurred over geologic time.
Magnetic axis that has wandered over time?
Poles
What has cause the zebra pattern in the rock of ocean floor?
Caused by changes in earth's magnetic field over time, especially reversals of the magnetic poles.
What has caused the zebra pattern'' in the rock of the ocean floor?
Caused by changes in earth's magnetic field over time, especially reversals of the magnetic poles.
What has caused the zebra pattern in the rocks of the ocean floor?
Caused by changes in earth's magnetic field over time, especially reversals of the magnetic poles.
How does earths magnetic field change over time?
It changes over time through direction and strength. So therefore Magnetic North becomes Magnetic South.
Which location is the magnetic field the strongest?
A magnetic field is generally strongest (most concentrated) at a pole. Note that, while familiar magnets have two poles, it is also possible for a magnet to have more than two. Whether a magnet could have only pole is controversial. The Earth's magnetic field is strongest at the north and south magnetic poles, which are near the north and south geographic poles. The magnetic poles move over time and are generally not located precisely at the geographic poles.
Why does the earths magnetic field change over time?
The Earth's magnetic field changes over time because that is the way that God makes it.
What is the meaning of pole when describing earth?
Earth has two pairs of poles, the geographic north and south poles and the magnetic north and south poles. The geographic poles are the two places where Earth's rotational axis, the imaginary line that represents the center of Earth's rotation, intersects the surface of the earth. The magnetic poles are where Earth's magnetic field diverges/converges, just like the poles of a bar magnet, except that Earth's north magnetic pole is comparable to the south pole of a bar magnet, and Earth's south pole is comparable to the north pole of a bar magnet. The locations of the geographic poles never change, but the magnetic poles wander around from time to time. In fact when studying the floor of the Atlantic Ocean for the first time scientists found evidence that the polarity of Earth's magnetic field completely reverses every few hundred millennia (the north and south magnetic poles switch places).
How does a change over time?
Caused]by Magnetic "storms " in the surface and near surface
How have switches in the location of earths magnetic poles been determined?
Magnetism leaves particles in molten metals lined up with north and south poles (magnetic poles, not the Earth's poles). Over time different layers of rock show that the N-S and S-N poles have switched, with S pointing in one direction and S pointing in a different direction depending on the age of the rock.
