What is the knowledge of the earth, what is the knowledge of the earth?

Earth is the third planet in the solar system from the inside to the outside, and it is also the terrestrial planet with the highest diameter, mass, and density in the solar system. It is also often referred to as the world. The English word earth comes from Old English and Germanic languages.

The Earth is 4,446 billion years old, and a natural satellite, the Moon, orbits the Earth in a 30-day cycle, while the Earth rotates in a cycle of nearly 24 hours and orbits the Sun in a one-year cycle. Disney has a documentary of the same name.

The name "earth" comes from the Old English word "eorthe". When people don't know that the earth is a planet, the word "earth" simply denotes the earth on which people walk. Later the word denoted not only the earth under our feet, but gradually the whole world itself.

As for when the word appeared, there is no way to verify. Earth is one of the eight planets in the solar system, the international name is "Gaia", and it is the third planet in order of being from the sun. It has a natural moon--- the Moon, which form a celestial system --- the Earth-Moon system.

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

2. Refers to the whole world: if the youth is strong on the earth, the country is strong on the earth.

Qing · Liang Qichao's "Juvenile China Says".

3. 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.

The current best estimate of the Earth's age is 100 million years, and what is commonly referred to as the Earth's age 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.

More than 90% of people don't know anything about the earth! How many do you know?

The knowledge of the earth has:

1. The Earth is the third planet from the Sun and the only celestial body known to nurture and support life.

2. The surface of the earth is approximately a land mass of continents and islands, and the rest is covered by water, mostly by oceans, bays, and other saltwater bodies, but also by lakes, rivers, and other fresh waters, which together form the hydrosphere.

3. The Earth's atmosphere is mainly composed 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.

4. The gravitational pull of the Earth interacts with other objects in space, especially the Moon, which is the only natural satellite of the Earth.

5. 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. The gravitational interaction between the Earth and the Moon causes tides that stabilize the direction of the Earth on its axis and gradually slow down its rotation.

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Analysis: Earth is one of the nine planets in the solar system, and it is the third planet in order of proximal to farther. It has a natural satellite --- the Moon, which form a celestial system --- the Earth-Moon system.

The Earth rotates from west to east while revolving around the Sun. The combination of the Earth's rotation and its orbital motion produces the alternation of day and night and the changing seasons on Earth. The speed at which the Earth rotates is uneven.

At the same time, due to the gravitational effects of the sun, moon and planets, as well as the various effects of the atmosphere, oceans and internal materials of the earth, the direction of the earth's axis of rotation in space and the earth itself must change. 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 Earth as seen by the Apollo spacecraft The Earth as seen by the Apollo spacecraft The Earth rises above the horizon of the Moon, and the Earth can be seen as consisting of a series of concentric layers. The Earth's interior has a core, mantle, and crust structure. The Earth's exterior has a hydrosphere and atmosphere, as well as a magnetosphere, forming a coat that surrounds the solid Earth.

Earth, as a planet, originated from the primordial solar nebula 4.6 billion years ago.

Basic data on the planet.

The radius of the equator is 6378140 meters.

Flattening factor. Quality grams.

The average density is gram cm3

Surface gravitational acceleration (equator) cm sec2

Surface gravitational acceleration (polar) cm sec2

Rotation period: 23:56:4 (mean solar time).

Orbital half-length diameter ** km.

Eccentricity of the orbital revolution.

The orbital period is 1 sidereal year.

Yellow and red angle 23 degrees 27 minutes.

The knowledge about the earth has a name**, an introduction to the environment, the origin of the earth, the structure of the earth, and the evolution of the earth.

1. The ** of the name

The name "earth" can be traced back to the ancient Greek scholar Aristotle's proposal of the name "earth" from the philosophical "perfection" and mathematical "equilibrium" of the sphere.

2. Environmental introduction

The Earth belongs to the solar system in the Milky Way, between Venus and Mars, and is the third closest planet to the Sun in the solar system, with a natural satellite. Earth was the first planet to be discovered with a living individual.

3. The origin of the earth

According to the location of the earth's formation, the origin of the earth is divided into two schools: the traditional school believes that the earth was formed within the solar system; The modern school of thought holds that the Earth was formed outside the solar system.

4. The structure of the earth

The Earth's surface is divided into several hard parts, or plates, that move around the surface in geological cycles. About 71% of the Earth's surface is oceans, and the rest is divided into continents and islands. Liquid water is necessary for all known life, but does not exist on the surface of all other planets.

The Earth's interior is still very active, with a thick mantle, a liquid outer core and a solid iron core.

5. The evolution of the earth

In different geological periods, the geological processes are different and the characteristics are different. In various geological periods, the major events that occurred in the cosmic space related to the earth and the solar system and the earth have left records in the earth itself, crustal movements, strata, rocks, tectonics, paleontology, paleomagnetism, paleoglaciers, paleoclimate and other aspects.