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It changes over time through direction and strength. So therefore Magnetic North becomes Magnetic South.
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∙ 12y ago
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How do rocks record changes in earths magnetic field?
Rocks which are liquid (lava) have their magnetic particles aligned to the local magnetic field as they cool and solidify. The rocks can be dated by the radioactive decay processes. If there is a new layer of rock (lava) laid down over this same deposit and the magnetic filed has altered, the new rock will have a different imposted magnetic field and age than the older rock.
Is the magnetic pole near the Earths true North Pole a magnetic south pole or a magnetic north pole?
Earths geographic North Pole is also currently a magnetic north pole. This is however not always the case because over geological time scales the Earth's magnetic poles flip as a result of changes of flow in Earth's molten core which produces Earth's magnetic field.
What is the difference between the magnetic field of the Earth and the magnetic field of a bar magnet?
"http://wiki.answers.com/Q/How_are_a_magnets_magnetic_force_and_magnetic_field_different"
What happens to earth's magnetic field over time?
It weakens and eventually disappears
How does the earth stay at a constant temperature?
Earths core temperature is sustained by fissile materials slowly breaking down over time. This energy is dissipated to space and will eventually run out. Much like Mars, Earths core and mantle will become solid and Earth will lose its magnetic field. Earths surface temperature is a function of many variables. Among those variables are; The previously mentioned magnetic field limits solar radiation to the thermosphere, Greenhouse affects of diffuse materials in the atmosphere reflect heat back to the surface, And convective currents circulate heat between regions of different temperatures.
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.
How do earths magnetic field magnetize an iron bar over many years?
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
What is it called when rocks are different because Earths magnetic poles change places?
Magnetic Reversal. Several magnetic reversals have occurred over geologic time.
How a compass can be used to trace the magnetic field of the magnet?
The pull of the magnet will over ride the earths magnetism. So the compass will react to the magnet as it passes through its field.
How do rocks record changes in earths magnetic field?
Rocks which are liquid (lava) have their magnetic particles aligned to the local magnetic field as they cool and solidify. The rocks can be dated by the radioactive decay processes. If there is a new layer of rock (lava) laid down over this same deposit and the magnetic filed has altered, the new rock will have a different imposted magnetic field and age than the older rock.
Without earths magnetic field what would happen to earths ozone?
Probably very little would change if you either doubled the magnetic field strength, reversed it, or made it zero. If you reversed it, the larger hole might form over the north pole. UV-C from the Sun makes ozone in the ozone layer, most solar wind (the stuff affected by our magnetic field) does not survive to reach the ozone layer. The poles might retain a bit more ozone into the late spring, with a nearly unmeasureable decrease in overall ozone levels to match.
How can the magnetic field of the Earth be sued to estimate the age of rocks found in the Earth?
By knowing the precise orientation of the rocks magnetic field, you can compare its magnetic field direction to the known direction of the magnetic field over time since the "north pole" wanders over time. The rock locked in its magnetic field when it cooled from magma.
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.
If your car moves over a wide closed loop of wire embedded in a road urface is the magnetic field on the earth within the loop?
yes the perpendicular component of earths magnetic field passes through the loop even if the car is moving above it or not , but no current is induced in the loop since it is not moving
What is needed for electromagnetic induction?
An electric current is produced by the change in Magnetic flux over timeRead more: How_do_electromagnets_work
Is the magnetic pole near the Earths true North Pole a magnetic south pole or a magnetic north pole?
Earths geographic North Pole is also currently a magnetic north pole. This is however not always the case because over geological time scales the Earth's magnetic poles flip as a result of changes of flow in Earth's molten core which produces Earth's magnetic field.
What do lava samples tell scientists about what has happened to the earth magnetic field over geologic time?
The magnetic field periodically changes its orientation.
