About 2 million years ago, when mankind was born on the earth, this lovely planet prepared a beautiful and comfortable living environment for mankind-vast land, vast ocean, dense forests, green mountains, green grasslands, fresh air, clear rivers and charming lakes! 3. The earth is a crystal ball, with blue and white lines intertwined, surrounded by a thin layer of water blue "tulle". The earth, the mother of human beings and the cradle of life, is so beautiful, spectacular and amiable.
As the mother of human beings and the cradle of life, the earth is so amiable, beautiful and spectacular, intoxicating and infinitely attached. According to the astronauts who came back from the universe, when they traveled in space, they saw a glass ball with blue and white stripes, surrounded by a thin layer of blue gauze (atmosphere), crystal clear and shining with gorgeous aura.
6. The eagle strikes the sky, the fish is shallow, the trees are towering, and the flowers are beautiful. These energetic life activities are vivid poems, exciting songs and the beauty of nature! Oh, beautiful earth, lovely earth, my dear mother! 7. In the starry universe, there is a blue star that gave birth to life. She is the earth.
2. A good sentence to describe the earth, Haoduan Earth is a beautiful blue star, a 5000-year-old birthday star. Originated from Pangu. About 5000 years ago, the relationship between heaven and earth gradually evolved, and various creatures appeared. Only because of the earth, human beings will appear in this vast universe and explore the mysteries of the endless universe. New truth. The earth in reality is a huge teardrop, blue and deep, and human beings are wrapped in it from birth and look like amber. The earth is a crystal-clear sphere, with blue and white lines intertwined and covered with a thin layer of water-blue tulle. The earth, the mother of human beings and the cradle of life, is so beautiful, spectacular and amiable.
3. Who knows the good words and sentences about the earth: spring flowers are gorgeous, lush and memorable. Sweat, green, fat, red and thin, the fruit is rich and fruity, attractive, full of fruit, melon fragrance, fruit fragrance, fat juice, orchard sweet, fragrant, fruity, fruity. Red fruits are full of branches and broken wires, even red and green. Good sentence: 1, ah! What a noble idea! What a great soldier! For the love of thousands of people in Qian Qian, they gave their all and defended the sons and daughters of the motherland with their blood and lives. Aren't they our most respected relatives? Moonlight, like running water, falls quietly on this leaf and flower, and there is a thin layer of blue fog floating in the lotus pond. Leaves and flowers seem to be washed in milk, like veiled dreams.
There is a worn-out floral schoolbag in my desk bucket. Although shabby, it is my boat and my treasure. The schoolbag is a small boat, which carries me across the sea, across the rapids, across the rapids, drifting and sailing to the other side of victory; The schoolbag is a treasure, which contains my mother's affection and love and gives me the strength to move forward.
It finally took shape: a wide band made a modest cloth pocket, which really looked like a boat with the words "study hard and make progress every day" embroidered on it. The "height" of ordinary brush is about 6 inches, and this structure is only to meet the writing needs of different styles such as regular script, running script and cursive script.
The pen container is made of Coca-Cola cans, and hundreds of small conch shells stuck on the surface form a strange figure. There are more than 90,000 books in the library, from students' works to Shakespeare's plays, from simple science books to Einstein's masterpieces.
How many nights, the small desk lamp is on, accompanying me to review my lessons, it knows my troubles and happiness best. High mountains, high mountains, strange mountains, barren hills, hillsides, forests, Qian Shan, a mountain garden, all kinds of rocks, majestic mountains, clear water, beautiful mountains, lush valleys, green mountains and green waters, clear mountains and strange mountains in Qinghai, beautiful and barren, towering into the clouds, winding clouds, towering peaks, majestic mountain clusters in Wanling, Qian Shan.
The surrounding mountains are like a colorful cloth. The mountains and waves are stacked on top of each other.
The mountains are dark and boundless, and the knives and axes are indomitable. The undulating loess hills are really like the waves of a big flood.
Longshan is like a big grave, standing in the night. The mountains on both sides of the Xiajiang River go straight up and down, which makes people dizzy.
The deep valley is strangely quiet and cold. The ravine is full of snow, as high as the back of the mountain, and it has become a flat snow paved square.
At the beginning of the morning, the mountains are like shy girls, looming and the sun is setting. Words: Long summer into summer solstice, early summer, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice, summer solstice and summer solstice. Spring goes to early summer, summer comes to the Spring Festival Evening, and early summer is orderly. Summer is in midsummer, summer is in the past, summer is at its climax, summer is at its climax, summer is at its climax, summer is at its climax, summer is at its climax, summer is at its climax, and summer is cool. Summer summer is hot, summer is hot, May, July and June are in full swing, summer is hot, summer is hot, summer is hot, summer is hot, summer is rainy, summer is rainy, summer is harvested, summer is sown, summer is busy, summer is sunny in June, summer is hot, summer is terrible, sun is poisonous, sun is hot, sun is hot, summer is hot, summer is hot. Xia Shu summer green water soup summer moon cicada singing sentence July, blue sky, hanging like a fireball of the sun, clouds seem to be melted by the sun, but also disappeared without a trace.
Spring goes with the falling flowers, and summer comes with green leaves in the warm wind. The early summer sun shines through the dense branches and leaves, and the ground is covered with shiny spots the size of copper coins.
The wind blows with a slight warmth, and cuckoos sing from time to time. It is telling us: "Spring is over." Grass, reeds and red, white and purple wildflowers are steamed by the fiery red sun hanging high in the air, and the air is filled with sweet and intoxicated breath.
In early summer, all kinds of wild flowers are in full bloom, red, purple, pink and yellow, like bright spots embroidered on green carpets; Crowds of bees are busy among the flowers, sucking the stamens and flying around with difficulty. In midsummer, it is so hot that even dragonflies only dare to fly near the shade, as if they were afraid that the sun would burn their wings.
There is not a cloud in the air, there is not a wind, there is a scorching sun overhead, and all the trees are standing there listlessly and lazily. In midsummer July, there is not a cloud in the blue sky. The sun is scorching the earth, the water in the river is boiling hot, and the soil in the field is smoking.
Under the scorching sun, on both sides of the road, ripe grains bent down and lowered their heads in the heat. Grasshoppers, like grass leaves, make a weak and noisy sound in wheat fields and rye fields, among the reeds on the shore.
The sun is like a fireball of the boss, the light is burning, the road surface is scorched by the scorching sun, and a pile of white smoke is stepped on. It's sweltering and there's not a breath of wind. The thick air seems to have solidified.
The whole city is like a burnt-out brick kiln, which makes people breathless. Dogs lie prone on the ground with bright red tongues, and mules and horses have particularly large nostrils.
Flaming parachutes are hanging high in the air, so hot that fish in the river dare not surface and birds dare not fly out of the mountains. Even the dogs in the village just stick out their tongues and gasp endlessly. That day, it was terribly hot.
As soon as the sun came out, the ground was already on fire, and some gray gases, like clouds, like Feiyun, like fog, like fog, floated low in the air, making people feel breathless. It was a long summer without rain, and the old loach in the field was turned white by the scorching sun. The stream near the village dropped several inches, and the stones above the water suddenly became bigger.
I don't know where the bird went; The vegetation is dejected and despondent, as if dying; Only cicadas keep chirping in the branches; It's really breaking gongs and drums to cheer for the scorching sun! The willow trees in the street seem to be sick, and the leaves are hanging with dust and rolling on the branches, and the branches are still. There is white light on the road, and the vendors dare not shout. The plexiglass signboard at the door of the store seems to have been sunburned.
Good words: star, star, cold star, lonely star, morning star, star.
4. Good words and sentences describing the earth 1, the earth has been changing every day for more than 5 billion years.
About 2 million years ago, when mankind was born on the earth, this lovely planet prepared a beautiful and comfortable living environment for mankind-vast land, vast ocean, dense forests, green mountains, green grasslands, fresh air, clear rivers and charming lakes! 3. The earth is a crystal ball, with blue and white lines intertwined, surrounded by a thin layer of water blue "tulle". The earth, the mother of human beings and the cradle of life, is so beautiful, spectacular and amiable.
As the mother of human beings and the cradle of life, the earth is so amiable, beautiful and spectacular, intoxicating and infinitely attached. According to the astronauts who came back from the universe, when they traveled in space, they saw a glass ball with blue and white stripes, surrounded by a thin layer of blue gauze (atmosphere), crystal clear and shining with gorgeous aura.
6. The eagle strikes the sky, the fish is shallow, the trees are towering, and the flowers are beautiful. These energetic life activities are vivid poems, exciting songs and the beauty of nature! Oh, beautiful earth, lovely earth, my dear mother! 7. In the starry universe, there is a blue star that gave birth to life. She is the earth.
5. Good words and sentences about protecting the earth. The earth is our only home to protect resources and environment. It is the same responsibility of mankind to be kind to the earth and protect the geological environment. To do a good job in geological environment monitoring and prevent geological disasters, we must adhere to the principle of prevention first, combining avoidance with governance, protecting land and resources, ensuring sustainable economic and social development, and protecting resources and environment, which is conducive to the present and strengthening the legal system in the future. Protect resources and environment, protect geological landscape, cherish geological relics, strengthen the rectification of mineral resources management order, and realize the sustainable development of mining economy. Labor is the father of wealth, and land is the mother of wealth. Protecting cultivated land means protecting our lifeline. Cherish and make rational use of land, effectively protect cultivated land but save every inch of land. Land development and consolidation for future generations should adhere to three aspects: quantity protection, quality protection and ecological protection, coordinate and unify human home earth, adhere to scientific development and build a harmonious society. Only by establishing harmony between man and nature can we have a bright future, scientifically develop and rationally use resources, realize harmony between man and nature, treat the earth well, protect resources and the environment, that is, protect ourselves and rationally use resources, and rely on scientific and technological progress to benefit future generations. Improve the ability to ensure resources, protect and rationally utilize resources, take the road of sustainable development, adhere to the basic national policy of protecting resources, build a resource-saving society, protect and save resources, and destroy and waste resources shamefully.
6. The sentence describing the earth is in urgent need 1543. Copernicus first put forward the concepts of rotation and revolution of the earth in his book "On the Operation of Celestial Bodies".
Since then, many observations and experiments have proved that the earth rotates from west to east and revolves around the sun at the same time. 185 1 year, the French physicist Foucault successfully conducted a famous experiment (Foucault pendulum experiment) in Paris, which proved the rotation of the earth.
The earth's rotation period is about 23: 56 minutes and 4 seconds. When the sun is flat, the orbit of the earth's revolution is elliptical. The half-length diameter of the track is 149597870 km, and the track eccentricity is 0.0 167. Period of revolution is a sidereal year with an average revolution speed of 29.79 kilometers per second, and the intersection angle between the ecliptic and the equator (the intersection angle between the ecliptic and the equator) is 23 27'.
The combination of the earth's rotation and revolution has produced the alternation of day and night, the change of four seasons and the distinction of five zones (tropical zone, north-south temperate zone and north-south frigid zone). The speed of the earth's rotation is uneven, with long-term change, seasonal change and irregular change.
At the same time, due to the gravitational effects of the sun, the moon and the planets, as well as the various effects of the atmosphere, the ocean and the materials inside the earth, the earth's rotation axis will change in space and the direction of the earth itself, that is, precession nutation, polar shift and angle change. The concept that the shape and size of the earth is spherical can be traced back to the fifth and sixth centuries BC.
At that time, the Pythagorean philosophers in Greece only produced this concept from the most beautiful sphere concept. Aristotle scientifically demonstrated that the earth is a sphere for the first time according to the fact that the shadow on the moon is round during the eclipse.
China As early as the Warring States Period, the philosopher Hui Shi put forward the view that the earth is spherical. In the 3rd century BC, the ancient Greek geographer Eratosthenes successfully measured the meridian length between Aswan and Alexandria by triangulation.
During the Tang Dynasty in China, the survey team led by Nangong Shuo, under the guidance of a delegation, conducted the earliest arc survey in the northern and southern plains of the Yellow River in Henan Province, and calculated that the difference in the horizontal height of the North Pole was one degree, which was equivalent to the difference in the ground distance between the north and the south of 0, about 3,565,438+80 steps (the length unit of the Tang Dynasty was 5 feet = 1 step and 300 steps = 1 mile). This work was similar to that of Arabs.
In modern times, in addition to geodetic methods; Gravity measurement can also be used to determine the equilibrium shape of the earth. After the launch of the artificial earth satellite, the geodynamic geodesy method has made great progress.
The combination of various methods greatly improves the accuracy of determining the shape and size of the earth. In the astronomical constant system of 1976 international astronomical union, the equatorial radius α of the earth is 6378 140m, and the oblateness factor of the earth is 1/f is 298.257.
The earth is not a right sphere, but a flat sphere, or more like a pear-shaped rotating body. The observation results of artificial earth satellites show that the equator of the earth is also an ellipse, so the earth can be considered as a triaxial ellipsoid.
The inertial centrifugal force of the earth's rotation makes the spherical earth gradually expand from the poles to the equator, becoming a slightly flat rotating ellipsoid, and the radius of the polar pole is about 2 1 km shorter than the radius of the equator. The inhomogeneity of material distribution in the earth further causes the irregularity of the surface shape of the earth.
In geodesy, the so-called shape of the earth refers to the shape of the geoid, on which the gravity potential is the same everywhere, which is an equipotential surface. The gravitational force of the sun and the moon on the earth makes the ocean and atmosphere on the earth tidal, and also makes the solid earth (to some extent, an elastic body) elastically deformed, which is called "solid tide".
Mass and acceleration of gravity The mass of the earth is 5.976*l027, which is determined according to the law of universal gravitation. The determination of the mass of the earth provides a basis for determining the mass of other celestial bodies.
From the mass of the earth, it can be concluded that the average density of the earth is 5.52g/cm3. Any particle on the earth is affected by gravity and inertial centrifugal force, and their resultant force is gravity.
Gravity decreases with the increase of height and changes with the change of latitude. The acceleration of gravity at the equator is 978.gal (cm/s 2), and at both poles it is 983.2 gal.
Gravity anomalies will occur in some places, reflecting the uneven distribution of materials in the earth. Gravity anomalies are related to geological structures and deposits.
Due to the tidal force of the sun and the moon, the acceleration of the earth's gravity also varies slightly periodically, up to several tenths of milligal. The tectonic earth can be considered as a series of concentric layers.
There are core, mantle and crust structures in the earth. Outside the earth, there are hydrosphere, atmosphere and magnetosphere, forming a coat around the solid earth.
The magnetosphere and atmosphere block the direct bombardment of the ground by ultraviolet rays, X-rays, high-energy particles and countless meteors from space. More than seven-tenths of the earth's surface is covered by blue oceans, and lakes and rivers account for only a small part of the earth's surface waters.
The liquid water layer on the earth's surface, called hydrosphere, has been formed for at least 3 billion years. The earth's surface is composed of various rocks and soils, and the ground is rugged, and low-lying areas flood into oceans and lakes; There are plains and mountains on the land above the water.
The total vertical fluctuation of the earth's solid surface is about 20km, which is the height difference between the top of Mount Qomolangma (the elevation of Mount Qomolangma is 8844.43m as determined by the China mountaineering team) and the deepest part of the ocean (the depth of Mariana Trench is about 1 1km), which is more than half of the average thickness of the continental crust. The seabed is as uneven and unstable as land.
The rocks on the seabed are much younger than those on land. Most rocks on land are less than 2 billion years old.
Sedimentary rocks can be seen everywhere on the land, indicating that these places may be oceans in ancient times. Although there are several craters on the earth's surface, it is difficult to find as many craters as the moon, Mars and Mercury. This is because the earth's surface is constantly weathered, eroded and disintegrated by external forces (water and atmosphere) and internal forces (earthquakes and volcanoes).
For a long time, it has been thought that the crustal tectonic movement is mainly characterized by the uplift and subsidence of the ground, with vertical movement as the main movement and horizontal movement as the supplement. In recent ten years, more and more scientists believe that the upper part of the earth has not only vertical movement, but also greater horizontal movement, and the relative position of the ocean and the mainland also changes during geological periods.
Wei Gena put forward the hypothesis of continental drift. Since then, some geologists believe that there are two ancient continents on the earth-Gondwana in the southern hemisphere and Lauya in the northern hemisphere.
But for a long time, many disciplines.
7. Praise the earth, thank you, my mother! It's dawn. You held the baby in your arms and shook it. Now I'm climbing on your back.
Earth, my mother! I took me with me in this paradise.
You are still in the ocean, playing some music to soothe my soul.
Earth, my mother! I used to, now and in the future, eat you, wear you and live with you. How can I repay your kindness? Earth, my mother! From now on, I don't want to live at home often. I will always show my filial piety to you in the open air. Earth, my mother! What I envy is your dutiful son, the farmer in that field. They are the nannies of all mankind, and you will always take care of them.
Earth, my mother! What I envy is you fat people, workers in charcoal pits. They are Prometheus of all mankind, and you have been holding them. Earth, my mother! I think except farmers and workers, everyone is the black sheep and grandson, and I am also your black sheep and grandson. Earth, my mother! I envy all the plants, my compatriots and your descendants, who enjoy their lives freely, independently and healthily with the land. Earth, my mother! I envy all animals, especially earthworms-I just don't envy the birds in the air: they want to fly in the air without you. Earth, my mother! I don't want to fly in the air, I don't want to ride a car, ride a horse, wear socks and shoes, I just want to go barefoot and be blind with you forever. Earth, my mother! You are my real witness. I don't believe that you are just a bubble of dreams. I don't believe that I am just an ignorant person. Earth, my mother! We were all born in Yi Yin. I don't believe there is a father in heaven. Earth, my mother! I think all the phenomena in the universe are your embodiment.