Why does the earth have north and south poles, and what are the north and south poles of the earth?

Because the earth has a fixed axis of rotation!

The South Pole and the North Pole, are the two points where the imaginary axis of rotation of the Earth intersects with the Earth's surface, and they are the two endpoints on the Earth. In the southern hemisphere, it is called the South Pole, and in the northern hemisphere, it is called the North Pole.

The North and South Poles are where all the meridians on Earth converge. The distance between the meridians from the South Pole or North Pole to the equator is equal. Since the Earth revolves around its axis of rotation, the poles are the only two fixed points on the Earth's surface.

However, long-term observations have shown that these two poles on Earth are not moving all the time, but are constantly moving slowly. This movement of the Earth's poles is known as "pole shifting". Pole shift may be related to large **.

The reason is that the pole shift will cause large-scale material migration in the earth's interior, and this material migration may be the cause of the big **.

In the polar regions, the sun shines obliquely all year round, and the phenomenon of "polar day" and "polar night" often occur, "polar day" means that the sun can be seen 24 hours a day, and "polar night" is that the sun cannot be seen 24 hours a day. In the polar regions, it is usually half the day and the other half night. Although half of the year is daylight, there is very little light that can reach the poles to increase heat.

So the polar regions are still icy all year round. Some scientists estimate that in some parts of Antarctica, there may be extremely low temperatures of -90 to -100. In such a cold environment, no tree or grass can survive naturally.

However, it is strange that a large number of penguins can live there happily.

Because the earth is like a compass, the earth is a big magnet, the magnetic north pole is in Canada, and the magnetic south pole is in Antarctica. The compass is a small permanent magnet. The south pole of a small permanent magnet points to the north pole of the earth, and the north pole of a small permanent magnet points to the south pole of the earth.

This is the result of its interaction with the Earth's magnetic field, but the direction of the compass is not always pointing south.

A magnetic field is created by an electric current in a conductor, which is the basic operating principle of both generators and electric lighting machines. The currently generally accepted theory of the Earth's magnetic field, about 2,000 miles under our feet, is close to 6,000 degrees Celsius, about the temperature of the surface of the sun, and the pressure is about a million times the atmospheric pressure, and under these conditions the nickel and iron in the core are liquid, and further down, under greater pressure, the atoms are squeezed together and cannot flow and become a solid, that is to say, the core of the earth is composed of two parts. The upper core is in a liquid state, and the lower core is solid.

According to the ** wave measurement, the thickness of about 1,500 miles of the earth's interior is liquid, and the liquid metal produces a magnetic field in rotation, and the magnetic field is then widened to produce a strong current, so that a strong earth's magnetic field is repeatedly formed.

The rotation of the Earth, the inner core, the gravitational pull of the Earth, the gravitational pull of the Sun, constitute a state of space.

The earth has two magnetic poles, which produce two magnetic fields.

The sun produces many kinds of radiation during its movement, and there are many rays in the universe.

The magnetic field generated by the north and south poles of the earth is to shift these rays away from the earth as much as possible, so that the creatures on the earth will suffer minimal damage, so please take care of Mother Earth.

Because the South Pole is the end point of the South Pole.

The South Pole is a very special position on the surface of the earth, it is one of the two points on the earth that has no directionality (the other point is the North Pole), standing on the South Pole, the three directions of east, west and south are completely meaningless, and there is only one direction in the north.

At the South Pole, the sun only rises and sets once a year, the sun never sets for half a year, it is all daytime, the sun revolves around the South Pole in a place that is not high from the horizon, and it never sets, also known as "polar day", there is no sun for half a year, it is all night, also known as "polar night". The time at the South Pole is actually in "International Standard Time", or Greenwich Mean Time.

Features:

The South Pole is covered with ice and snow all year round, with a thickness of 2,000 meters and an altitude of 2,800 meters. The climate is unusually harsh, with an average annual temperature of minus 48 degrees and an average summer temperature of minus 25 30 degrees, with the highest temperature ever recorded. The average winter temperature is minus 55-60 degrees, the lowest recorded temperature is minus zero, and the average annual precipitation is 3 mm.

The South Pole is not the highest point of the Antarctic ice sheet, and the snow and ice covering the South Pole move at a rate of about 10 meters per year, so scientists have to re-calibrate the latest position of the South Pole once a year to set a benchmark.

The above content refers to Encyclopedia - South Pole.

The earth is a magnet.

What does it mean for the earth to be considered a magnet. There is often a misconception, and (Figure 1) provides an excellent example of this misunderstanding. Can you see what's wrong?

Starting with some definitions and conventions of physics is a good place to start. My middle school physics textbook says that if a bar magnet is suspended by a rope or mounted on a pivot, one will find that the bar magnets are roughly aligned in a north-south direction, and the same end of the bar magnet always points north.

For this reason, we call the end of the magnetic stripe toward the North Pole the n-pole and the end toward the South Pole the s-pole. This way we can mark the n pole or the s pole of all bar magnets.

So far so good. But this definition doesn't apply to the Earth itself, because we can't let the Earth hang up to see which direction its magnetic force is pointing. So we have to consider some of the properties of magnetism and see if we can come up with a consistent answer about the Earth.

Let's consider that the lines in Figure 1 are designated as "magnetic field lines". How do you understand these magnetic field lines? Consider Figure 2, which shows a lot of the classic magnetic test, where many small iron filings are scattered on a magnet rod on a piece of paper.

The small iron filings act like a small compass pointing at one pole of the magnet (see Figure 3). Chip lines show no direction. However, we need to further consider the performance of the bar magnet and its poles.

Physics textbooks generally describe it this way: "When they are moved freely by attaching magnetic rods or hanging them on shafts, we find that the two magnets are repelled by the same poles, yet the different poles are attracted to each other." "With a slender magnetizing needle, the magnetic properties between one or several magnets can be measured, as well as the forces between individual, nearly isolated poles.

This experiment was first done by the physicist Charles Coulomb (1736-1806), a Frenchman, and was completed in 1785. Coulomb first discovered that the repulsive force between the two n-poles is inversely proportional to the square of the distance between them. He also found that the force is directly proportional to the strength of the magnetic pole).

Here there is a relationship similar to the gravitational force between opposite poles in inverse proportion to the square of the distance, but in the opposite direction of the repulsive force.

So we can imagine placing a magnetic needle around the n pole of the magnetic rod and drawing the net force on the magnetic needle. This.

A concept of the magnetic field generated by the magnetic force acting in a magnetic rod is provided, similar to the electrostatic field around an electric field (Figure 4).

Now we are ready to consider the behavior of the compass in light of these concepts. From Figure 5 we can see what happens to the compass in a magnetic field. Its pointer is oriented in the direction of the magnetic pole of the magnetic rod, i.e., the direction of the magnetic force from the n pole of the magnet to its s pole.

So we have the answer to our original question: How do we see the Earth as a (bar) magnet? The answer is a counter-intuitive statement, it is a "magnet", the n pole with a magnetic field is at the south pole of geography, and the north pole of geography is the s pole of the magnetic field.

That is, n and s in Figures 1 and 3 should be reversed!

This result is a nightmare for most physics books.