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The Earth has a magnetic iron core.
Actually, it isn't a magnetic 'core'. It is a magnetic deposit that is in the outer 20% of the earths mass. It is like a bubble of cherry juice under the crust of a pie baking. It moves around and slightly changes position over the years, but cycles back to it's prior position on a regular schedule. That is why magnetic north constantly moves back and forth. If you look at the 'magnetic declination', you will see how it changes from year to year. The Magnetic North Pole is actually some distance form the geographic north pole, north of the Hudson Bay. And by the way, the magnetic north pole is actually magnetically the south pole. If you have a magnet that is marked 'N' and 'S', suspend it from a string or place it in a floating saucer. The 'N' will point to the north, being attracted to the SOUTH (opposites attract) magnetic pole of the earth. Somewhere, this got reversed and no one wants to correct it.
(response) Allow me to quote from wikipedia: The Earth's magnetic field is mostly caused by electric currents in the liquid outer core. So, although it is the outer core, it is still the core. Not the outer 20% of the Earth's mass. Bear in mind, it is the core that is composed of highly conductive nickel and iron. The layer of magma in the mantle is not electrically conductive, therefore it would not support currents that could generate a magnetic field.
"mostly caused by electric currents in the liquid outer core" The liquid outer core as defined can be and probably is within the outer 20% of the earth's mass. "Inthe outer 20%" does not mean "is the outer 20%". The specific highly magnetic deposit that defines the earths magnetic field can be and is influenced by electrical current within the core or outer core as you wish. The magnetic deposit may not be totally magnetic on its own. Even as a nail in proximity of a pulsing electric current is not initially magnetic, it will become magnetised by the current, and eventually become magnetic because of the realignment of molecules within it. So yes, the current in the outer core causes or influences but is not the primary source of the earth's magnetic field.
What else can I help you with?
What do geoligists use to map the earths interior?
Geologists use seismic waves to map the Earth's interior. By studying how these waves travel through the Earth, geologists can infer information about the composition and structure of different layers beneath the surface. This helps them understand the different layers of the Earth, such as the crust, mantle, and core.
What is the method of scientist use to determine the characteristics of the earths interior?
They look at the elements of the landmass.
What is the main thing scientist observe in order to learn about the makeup of the earths interior?
Scientists use seismic waves to study Earth's interior. Seismic waves travel through the Earth and can be detected far from their source.
What magnetized steel needle that aligns with the magnetic of the earth is a?
A compass needle is a magnetized steel needle that aligns with the Earth's magnetic field. Its use allows for determining directions such as north, south, east, and west.
At the earths magnetic north pole it is pointless trying to use a compass to find your way?
That's correct. At the magnetic North Pole, the Earth's magnetic field lines are nearly vertical, causing compass needles to point straight downwards. This makes it difficult to navigate using a compass, as it will not give accurate readings.
What do geoligists use to map the earths interior?
Geologists use seismic waves to map the Earth's interior. By studying how these waves travel through the Earth, geologists can infer information about the composition and structure of different layers beneath the surface. This helps them understand the different layers of the Earth, such as the crust, mantle, and core.
What is the method of scientist use to determine the characteristics of the earths interior?
They look at the elements of the landmass.
Geologist use direct from what to learn about earths interior?
Geologists use evidence from seismic waves to learn about earth's interior. Geologists record the seismic waves and study how they travel through earth. By Brianna.
What magnet use in the compass?
non the compass uses the earths magnetic field that is why the north pole and south pole is the most important directions because the north and south pole have the most highest magnetic feilds
What geologists use direct evidence to learn about earths interior?
Geologists use evidence from seismic waves to learn about earth's interior. Geologists record the seismic waves and study how they travel through earth. By Brianna.
How do sailors use compass?
how they use the compass it so they won't get lost
What is the main thing scientist observe in order to learn about the makeup of the earths interior?
Scientists use seismic waves to study Earth's interior. Seismic waves travel through the Earth and can be detected far from their source.
What magnetized steel needle that aligns with the magnetic of the earth is a?
A compass needle is a magnetized steel needle that aligns with the Earth's magnetic field. Its use allows for determining directions such as north, south, east, and west.
Does a compass use mangnetism?
A magnetic compass does. Though there are other types of compass that do not
At the earths magnetic north pole it is pointless trying to use a compass to find your way?
That's correct. At the magnetic North Pole, the Earth's magnetic field lines are nearly vertical, causing compass needles to point straight downwards. This makes it difficult to navigate using a compass, as it will not give accurate readings.
What is use to find orientation on a map?
Compass
How scientists learn about earths interior?
Scientists learn about the Earth's interior through the use of seismographs. Since seismic waves travel at various speeds when passing through different types of material, scientists will be able to formulate the conditions of the Earth's interior.
