About what the shape of the earth is

The Earth is an irregular sphere with slightly flattened poles and a slight bulge in the middle.

This is determined by the peculiarity of the round shape.

Because the sphere is a central symmetry, every point on the surface is the same for the center—the same distance, the same force—this state should be the easiest shape to maintain relative to the others.

In addition, from the point of view of the formation of the earth, the earth was originally solidified by liquid, and by the action of gravity and tension, it was initially an approximate spherical shape. Moreover, even if the Earth was not circular at the beginning, it would have developed into a sphere during its continuous rotation for billions of years. The sharp places on the surface of the earth are more likely to be destroyed by external forces and gravity, which also makes the earth tend to be spherical.

As for why it is elliptical, it is because the earth is rotating.

The earth revolves around the earth's axis, and the equator is the fastest place to rotate, so the centrifugal force is large, and the earth's crust is "flung outward" and protrudes outward, becoming an ellipsoid.

To put it mildly, if you have time to knead a dough, insert a stick in the middle to make a shaft, and then quickly turn the shaft, you can also see the dough slowly flattening. This is the same as the flattening of the earth.

The Earth is an approximately pear-shaped irregular body with slightly flattened poles and a slight bulge in the middle.

It is oblate, and the diameters of east and west, north and south are different.

An irregular oblate sphere with slightly flattened poles and slightly bulging equator (from junior high school geography textbooks).

But be careful, don't think that the Earth is a strange shape because of this definition or the shape of the world map we often see. Judging from the ** sent back from space, the earth we live on is a beautiful blue perfect sphere.

In general it is spherical, but strictly speaking, it is pear-shaped.

It is an ellipse, short from north to south and long from east to west.

The poles are slightly flattened, the equator is more drummed, and the ellipsoid is approximately pear-shaped.

The poles are slightly flattened and the equator is slightly bulging irregular sphere.

Non-standard spheres are larger at the equator.

There is a technical term: terrestrial body.

The shape of the earth is:

The average radius of the earth is 6,371 kilometers, the maximum circumference is about 40,000 kilometers, and the surface area is about 100 million square kilometers. In fact, scientists have also debated the appearance of the earth. The British physicist Isaac Newton proposed that the Earth could not be a positive sphere because of its rotation on its axis.

Earth (English name: earth; Latin: Terra) is the third planet from the Sun and the only known celestial body that harbors and supports life.

Approximately the surface of the earth is a land mass made up of continents and islands. The remainder is covered by water, mostly by oceans, bays, and other saltwater bodies, but also by lakes, rivers, and other freshwaters, which together make up the hydrosphere.

The Earth's atmosphere is mainly made up of nitrogen and oxygen. The tropics receive more solar energy than the polar regions and redistribute it through atmospheric and oceanic circulation. Greenhouse gases also play an important role in regulating the surface temperature.

The climate of a region is determined not only by latitude, but also by factors such as altitude and proximity to the mild ocean. Severe weather such as tropical cyclones, thunderstorms, and heat waves often occur in a wide area and have a great impact on life.

The Earth's gravitational pull interacts with other objects in space, especially the Moon, which is the Earth's only natural satellite. It takes about a few days for the Earth to revolve around the Sun. The Earth's axis of rotation is tilted relative to its orbital plane, thus producing seasons on Earth.

Hello, happy with your question. The shape of the earth is an irregular sphere. It is not a normal sphere, but an irregular sphere with slightly flattened poles and slightly bulging equators, with an average radius of 6,371 kilometers, a maximum circumference of about 40,000 kilometers, and a surface area of about 100 million square kilometers.

The shape of the Earth is an irregular elliptical sphereWith the development of science and technology, people have a clear understanding of the shape of the earth: the earth is not a positive sphere, but an irregular sphere with slightly flattened poles and slightly bulging equators, with an average radius of 6,371 kilometers, a maximum circumference of about 40,000 kilometers, and a surface area of about 100 million square kilometers.

On the earth's surface, there are mountains, basins, rivers, lakes, and oceans, among others. It can be said that the surface of the earth is an extremely irregular curved surface, but these ups and downs are small relative to the whole earth.

The area of the earth is 100 million km2, the area of the ocean is about 100 million km2 of the earth's surface, and the land area is only about 100 million km2. The maximum undulation of the surface landform is 840m, and most of them account for 75% of the total area of less than 1000m.

The shape of the earth is also not static. It's always changing. Sometimes these changes are regular, such as the daily tides that affect the oceans and crust.

Other changes are irregular and very slow, such as the movement of the Earth's tectonic plates. Sometimes natural disasters cause sudden changes, such as **, volcanic eruptions, and meteor impacts.

1. The planet inhabited by human beings, one of the eight planets of the solar system, has an average distance of 149,597,870 kilometers (1 astronomical unit) from the sun, ranking third among the planets, and its equatorial radius is kilometers, ranking fifth among the planets in size.

2. The earth is an irregular spheroid with slightly flattened poles. The Earth rotates from west to east while revolving around the Sun. The combination of the Earth's rotation and its orbital motion gives it the day-night alternation and the seasons on Earth (the speed of the Earth's rotation and revolution is uneven).

At the same time, due to the gravitational influence of the sun, the moon, and nearby planets, as well as the earth's atmosphere, oceans, and internal materials, the direction of the earth's axis of rotation in space and the earth's body changes. 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. The time when the Earth accumulated from the primordial solar nebula to form a planet to the present.

At present, the best estimate of the Earth's age is 100 million years, and the general age of the lot is its astronomical age. The astronomical age of the Earth refers to the time when the Earth began to form to the present, which is closely related to the hypothesis of the origin of the Earth.

The Earth is an ellipsoidal body with a slightly larger diameter at the equator than at the poles. The Earth's polar diameter is 12,742 km and its equatorial diameter is 12,756 km.

Disguise Disguise.

The shape of the Earth: The Earth is not a positive sphere, but an irregular sphere with slightly flattened poles and a slightly bulging equator.

To put it simply: an irregular oblate sphere.

Details: 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 an ellipsoid with a slight uplift at the equator and slightly flattened 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.

If you look at it from a distance, you will see that the earth is shaped like a pear: its equatorial part is bulging, and it 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 is like a pear-shaped rotating body, so people call it "pear-shaped earth".In fact, the Earth is a triaxial ellipsoid, to be exact.

The Earth is not a positive sphere, but an irregular sphere with slightly flattened poles and a slightly bulging equator.

In fact, scientists have also debated the appearance of the earth. The British physicist Isaac Newton proposed that the earth could not be a positive sphere due to its rotation on its axis, but only an oblate sphere with compressed poles, an equatorial uplift, and an orange-like sphere, and derived the law of universal gravitation.

But Newton's theory was opposed, and Cassini, the first director of the Paris Observatory at the time, objected, arguing that the earth looked more like a watermelon. So King Louis XIV of France sent two expeditions to measure the radian of the meridian. As it turned out, Newton's theory of the flat ball was correct.

Introduction to Earth. Earth is the third planet in the solar system from the inside and outside, and it is also the terrestrial planet with the largest diameter, mass and density in the solar system, about 100 million kilometers away from the sun. The Earth rotates from west to east while revolving around the Sun.

At present, it is 100 million years old, and there is a natural satellite - the moon, and the two form a celestial system - the Earth-Moon system. It originated hundreds of millions of years ago from the primordial solar nebula.

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 the Portuguese navigator Magellan led 5 sea ships, with 3

years, completed the first voyage around the Earth, thus directly confirming that the Earth is spherical. Since then, people have unanimously referred to the world we live in as "Earth".