Is the earth round, or square, and the earth round or square? Be specific.

The Earth is a slightly elliptical sphere with a slightly larger equator and slightly shorter poles, but it is not so obvious that it is almost negligible to the naked eye. For a kilometer difference for a planet with an equatorial radius, the error rate is about 1 millimeter equivalent to the size of a blue ball). The highest Everest kilometer in the world, if compared with the average diameter of the earth of 6371x2 kilometers, the error rate is about the same as a blue ball, and the error rate is about the same as a blue ball, and the error millimeter is not visible to the naked eye without precision instruments.

Although the earth is not round in the strict sense of the word, it is customary to say that the earth is round.

As for the knowledge of the earth, we humans did not know from the beginning that it was round. The ancients believed that the earth was square, and they believed that the sky was round and the earth was round, which was caused by their inability to observe the earth comprehensively due to the constraints of the time.

In fact, not only the earth is round, but every planet is round, why is that?

The inventive conjecture (unproven, not a scientist's opinion, but a purely personal opinion of an inventoriac) only shows that the earth must have undergone a process of change from liquid to solid in the process of formation. Perhaps the Earth was also a small sun when it first formed, like the sun we see today, capable of emitting light and heat, and because of its small size (relative to the sun), it would take many billions of years (billions?) Billion?

Three billion? Nobody knows) its thermonuclear reaction has been aborted, and it can no longer emit light and heat, but the temperature on its surface is still very high, all red hot magma, and the action of gravity makes the liquid earth tend to be spherical (isn't this the case with the current sea level of our earth?). ）。

The centrifugal force generated by the rotation of the Earth makes the diameter of the equator slightly larger than the diameter of the north and south poles (kilometer radius of the equator, kilometer radius of the polar axis), which is also consistent with the facts.

Later, the temperature of the earth decreased, and the surface slowly became solid (which is also consistent with the red hot magma in the interior of the earth), and then because of the movement of the earth's crust, it became what we see now, but.

Overall, it's a.

Spherical. That's why the earth is round. At the same time, it is also the reason why all the planets in the universe are round. Of course, it cannot be said that the earth is purely round, but slightly.

A little flattened. This is just a little opinion of mine, I don't know if it's right or not, and it should be used as a reference.

The Earth is a sphere, but because of gravity.

It is not a perfect sphere, and the equator bulges outwards around it, forming a "spare tire" structure. In fact, the polar radius of the Earth is kilometers, while the radius of the equator is kilometers.

In ancient times, the earth was supposed to be square, and now it is definitely round. The core of the earth is not necessarily round, it is very likely to be square and rectangular, and the surface is just a layer of soil wrapped outside, forming a large round ball in the process of continuous operation, the core is hot, because the thickness of the soil is different, so the temperature of the surface is also different, the poles are the farthest from the core, and the equator is the closest to the core. Personally, I think that in the beginning, the earth was square.

After non-stop operation, it was coated with a thick layer of soil to form today's large round ball. If the Earth's core is round, the surface temperature should be the same. Then the difference in Earth's temperature should not be as obvious as it is now.

This will not work without such an explanation. So... It is highly probable that the earth was square in ancient times ...

And we humans are just a microorganism produced by the soil that wraps around the earth.

The earth is round, because he memorized many planets, and they were all round.

The question asked by the classmate seems very boring, but it is actually very profound, everyone on the earth knows that the earth is spherical, but those who have studied physical geography know that the earth is not actually a spherical in the real sense, since it is not a ball, so what shape is it?

The inertial centrifugal force generated by the rotation of the earth causes the spherical earth to gradually expand from the poles to the equator, becoming the current slightly flattened spheroid, with a polar radius about 21 kilometers shorter than the equatorial radius.

Due to the attraction of the sun to the earth, the earth moves elliptically around it, and the earth itself is also rotating at high speed, which makes the earth cannot be round or square, and the strong attraction and its own motion make it an elliptical ......In nature, everything has its way of being....

The earth is an oval blue sphere, and the difference with the earth is this world, the so-called no rules are not a circle, the earth is the world inhabited by human beings, in this world we need to experience the circle!

The earth is ellipsoidal, because the gravitational force of the earth is not much different, so the adsorption force on dust at the time of formation is about the same, so the current form is formed. The greater the mass, the greater the gravitational force.

Is the Earth round or square? To prove the problem, NASA personally came forward to prove it.

The earth is neither round nor square.

Interpretation. 1. Surface tensionA drop of liquid suspended in space is spherical! This is due to the action of surface tension.

The Earth is almost liquid except for the solid surface of the Earth, which is a solid surface, and the Sun is even more fluid. Due to the same principle, it is spherical.

Interpretation. 2. Gravitational force. If not affected by external forces, all objects have a tendency to concentrate towards the center under the action of gravitational force. The most concentrated knots.

It's spherical! Although the surface of the earth is solid, it is also deformable because the solid particles are also mobile, which makes it possible to transform it into a spherical shape.

The activity of energy in the Earth's interior makes the Earth irregularly shaped. However, the stones of the mountains are rolled down from a high place by the gravitational pull of the earth (gravitational pull), and the rivers carry the sediment from the high to the low-lying oceans (the rivers also flow by the gravitational pull of the earth)...These are all examples of concentration towards the center, and they all turn the earth from irregular to spherical.

If the Earth's interior ceases to move, it is possible that in many billions of years the Earth will become a very standard spherical shape (with the exception of centrifugal force and the gravitational pull of other celestial bodies).

Many asteroids, due to their own small mass, resulting in their own gravitational force is relatively small, and the star is generally composed of relatively hard solid rock, it is difficult to complete the process of moving to the center under the action of its own gravity, so their shape is strange, oval, rod-shaped.

The Earth is a sphere, but due to gravity, it is not a perfect sphere, and the equator bulges outwards to form a "spare tire" structure. In fact, the polar radius of the Earth is kilometers, while the radius of the equator is kilometers.

Hello, the Earth is a sphere, but due to gravity, it is not a perfect sphere, and the equator is bulging outwards to form a "spare tire" structure. In fact, the polar radius of the Earth is kilometers, while the radius of the equator is kilometers.

Questions. In this way, the earth is a circle, and when our earth is the northernmost north pole and the southernmost pole, shouldn't they be connected?

The earth is round, to be precise, the earth is a slightly flattened ellipsoid, and to be more precise, the earth is a slightly pointed north pole, a slightly concave south pole, and a pear-like shape at the equator. What we see with the naked eye thinks that the earth is flat, but in fact, the earth within the field of vision under our feet is an arc of the earth.

Yes, so can be thought of as well.

Questions. Perfunctory.

How far the South Pole is from the North Pole.

How to explain. The distance from the North Pole to the South Pole is in kilometers.

The North Pole refers to the northern end of the Earth's axis of rotation, which is the point at 90° north latitude. Antarctica, known as the Seventh Continent, is the last continent on Earth to be discovered and the only one uninhabited.

The Earth is not a positive sphere, but an ellipsoid, to be precise, an oblate sphere with slightly flattened poles and slightly bulging equators.

The Earth's South and North Poles are also asymmetrical, with the North Pole slightly convex and the South Pole slightly concave in terms of sea level.

Questions. Does that mean there is another side of the earth? There is another side of the South Pole and another side of the North Pole?

If there is no slightly flattened sphere on the other side, then their center point is the north and south poles, but is the north and south poles supposed to be connected, or is the south pole the opposite side of a world that we have not discovered, another world that is similar to ours?

If you stand at the South Pole, the opposite side is the North Pole, and the South Pole and the North Pole are both on the equator, and the same is true at the North Pole. Questions. ok

It is not square and round, because both square and circle are flat figures, and the earth is three-dimensional. It should be said that it is a less standard spherical shape. The shape of the earth, as the name suggests, is "spherical" shaped.

However, the understanding of the shape of the "sphere" has gone through a considerable process. In the fifth and sixth centuries B.C., ancient Greek philosophers believed that the earth was spherical based on the concept that the sphere was the most perfect. Around 350 B.C., the ancient Greek scholar Aristotle observed the lunar eclipse and scientifically demonstrated for the first time that the earth was a sphere based on the fact that the shadow of the moon was a circle.

Hui Shi, a philosopher during the Warring States period in China, has long put forward the idea that the earth is spherical. In 1519, five ships led by the Portuguese navigator Magellan completed the first voyage around the earth in three years, thus directly confirming that the earth is spherical. Since then, people have unanimously referred to the world we live in as "Earth".

The first to calculate the size of the earth should be said to be the Greek geographer Eratostes in the 3rd century BC. He succeeded in triangulation to measure the length of the meridian between Aswan and the great city of Yanlishan, and calculated that the circumference of the earth was about 250,000 Greek li (39,600 kilometers), which was only 340 kilometers short of the actual length, which was remarkable more than 2,000 years ago. With the development of science and technology, at the end of the 17th century, people began to doubt the claim that the earth is a perfect sphere.

In 1672, the French astronomer Li Xi discovered that the gravity of the earth's equator was smaller than that of other places, and put forward the idea that the earth was oblate spherical. At the end of the 17th century, the British scientist Newton studied the influence of the earth's rotation on the shape of the earth, and theoretically speculated that the earth is not a very round sphere, but a slightly uplifted spheroid at the equator, slightly flattened at the poles, and the equatorial radius is more than 20 kilometers longer than the polar radius. 1735 In 1744, the Paris Academy of Sciences sent two survey teams to northern Europe and South America to measure radians, and the results confirmed that the earth was indeed an ellipsoid.

After the 50s of this century, the development of science and technology is very rapid, opening up a variety of ways for geodesy, high-precision microwave ranging, laser ranging, especially artificial satellites in the sky, coupled with the use of electronic computers and international cooperation, so that people can accurately measure the size and shape of the earth. Through actual measurement and analysis, the exact data was finally obtained: the average equatorial radius of the earth is kilometers, the polar radius is kilometers, and the circumference of the equator and the perimeter of the meridian direction are 40,075 kilometers and 39,941 kilometers, respectively.

The measurements also found that the Arctic region was about a metre higher and the Antarctic region was 24.30 metres lower. The shape of the earth, it seems, is like a pear: its equatorial part bulges, which is its "pear body"; The North Pole is a bit pointed, like a "pear"; The South Pole is a bit concave, like a "pear navel", and the whole earth resembles a pear-shaped rotating body, so people call it "pear-shaped Earth".

In fact, the Earth is a triaxial ellipsoid, to be exact.

Is the Earth round or square? To prove the problem, NASA personally came forward to prove it.

The Earth was created long ago when rocks in the solar system collided with each other to form planets. From the beginning of its formation until the present, the earth has been mainly composed of liquid rocks. In space, where gravity is minimal, liquid matter will automatically form a spherical shape.

This has been demonstrated by experiments conducted by astronauts in the space environment with substances such as water, fruit juice and liquid metal. The Earth is a huge liquid sphere at a considerable distance from the Sun, which gradually forms a circle as it moves through space.

Asteroids and small stars such as the moons of Mars are so weak in their gravitational pull that they cannot form a circle once they form a solid star. Due to the large size of the Earth, its gravitational pull is strong enough to make itself circular. If there is no tectonic plate movement that makes the peaks taller, gravity will make the Earth become more and more round.

If you still don't understand, let's take a step back: imagine what it would be like if the Earth were square, tetrahedral, or some other irregular object? The first thing that appears is that there will be a lot of mountains on the earth.

Don't say I'm kidding you)

Then the Earth will rotate irregularly (and why?) You think, it's not round, it's uneven, it's unbalanced! And then it will be more susceptible to impact, and the wind in the universe will not be merciful, so what will happen?

He's going to be smoothed out over and over again.

Polished and rounded, so that in the end it is still round.