Descriptive text of dinosaurs

Everyone must have been exposed to writing, especially the expository writing that can't be ignored. According to different language styles, expository writing can be divided into two categories: simple expository writing and vivid expository writing. How do we write this type of composition? The following is my explanation of dinosaurs. Welcome to learn and refer to it. I hope it will help you.

The explanation of dinosaurs1.1400 million years ago, a group of powerful giants-dinosaurs appeared on the earth where we lived. They have different postures and temperaments. These big guys once ruled the earth for a while.

But in the late Cretaceous 65 million years ago, they suffered a huge disaster!

One day, a planet suddenly hit the earth. Suddenly, the earth fell and the dust flew. When it was hit, the earth trembled. The mountain fell, and the dinosaurs on the mountain and below were buried in the ruins. The cry of grief was very sonorous in the chaos.

Trees are also broken, towering trees are all over the earth, and the trees are called dragons and mixed together.

Rivers, lakes and sea water are sprayed indiscriminately. A wave is tens or hundreds of meters high. The dinosaur ran away crying, but to no avail. After all, it is all brought by the tide. They were dragged into the water, but they were still struggling. But in vain, a wave swept the behemoth into mid-air and fell alive. As a result, they can only sink on the blood-stained water-they can't resist!

The vibration of the earth slowly stopped.

-But dinosaurs have died out all over the mountains and Haiti.

Pterosaur hovered in the sky, making a solemn and stirring cry, as if mourning for the dead. Tyrannosaurus rex, stegosaurus, mamenxi dragon ... everything slowly calmed down and stopped running around. Immediately, they gave a deafening cry at the same time-bleak! This is confusion, this is fear.

However, God didn't want them to live.

Due to the violent impact, the dust on the earth was shaken up, and the air was full of dust of all sizes.

Since then, the earth has ushered in a long night of three months.

Without sunlight, plants on the earth will wither gradually because they can't continue photosynthesis. Many herbivorous dinosaurs died without food. Their death reduced the food of carnivorous dinosaurs and aggravated the extinction of five kinds of dinosaurs.

Due to the extinction of plants, the oxygen on the earth is becoming scarcer and scarcer, and it is more and more difficult for dinosaurs to breathe.

Finally, in just two months, all the dinosaurs were extinct. Of course, the dinosaur eggs left behind can't hatch.

Since then, dinosaurs, a huge family that once ruled the earth, have disappeared from the earth forever.

After more than three months, the first ray of sunshine shone on the earth. When the light appeared again, the earth was full of dead bodies.

A long time ago, on a huge island, there lived many dinosaurs. There are green boulders and dense forests on the island, and the clear river is flowing happily. Carol and Kelly are good friends. They play with water, throw stones, run and play hide-and-seek together every day, and have a good time.

One day, Carol and Kelly went to play hide and seek. Keli accidentally fell into a deep cave, where she was treated as delicious by poisonous scorpions, spiders and snakes. Carol is very sad because she lost a good friend.

One day soon, the green boulder suddenly exploded, and the huge shock wave turned the trees on the island into a sea of fire. Carol fled to the distance in panic, but there were flames everywhere, so he had to hide in a cave. I don't know how long it took. Carol came out of the cave, and it was in ruins outside. All the dinosaurs died, leaving Carol to live alone. I don't know how long it took, but white snowflakes floated in the sky. Carol died slowly for lack of food.

With the extinction of dinosaurs, the dinosaur era ended and a new era came.

Dinosaur Description 3 Do you know who was the overlord of Jurassic? Let me tell you, that's Tyrannosaurus rex. The following is its information:

Tyrannosaurus rex, also known as Tyrannosaurus rex, is an effective species in the model species, or Tyrannosaurus rex. It is a large carnivorous Tyrannosaurus rex, about 13 meters long and weighing about 7 metric tons. It lived in the last 3 million years of the Maastricht stage at the end of Cretaceous, about 68.5 million to 65.5 million years ago, and was the last dinosaur population before the Cretaceous-Tertiary extinction event. Fossils are distributed in North America, the United States and western Canada, and the distribution range is wider than other Tyrannosaurus rex.

It's my favorite dinosaur.

Below is the hadrosaur, which lived in the late Cretaceous 65438+ billion years ago and was the peak of dinosaur development, so it was abundant, accounting for about 75% of herbivorous dinosaurs. They are a large bird-buttock dinosaur. At present (2008), the body length of the discovered type exceeds 2 1 m. Due to the extension and lateral expansion of the maxillary and odontoid bones, the snout of the hadrosaurs formed a wide duckbill-shaped snout, hence the name.

I think it's cute.

Omnivorous dinosaurs, I prefer earthquake dragons. Earthquake dragon means "lizard of earthquake". It was first discovered in 1979, New Mexico, USA, in the late Jurassic. It has been found that the body has a tail; Back; Hips and hind limbs. At first glance, it looks like Liang Long, but the earthquake dragon has a longer tail and a thick pelvis. According to preliminary estimates, its length is at least 35 meters, even more than 40 meters. But now it has shrunk to 32 meters long and weighs 22-27 tons. Zhenlong has a long neck, a small head and a slender tail. The nose grows on the top of the head. Its head and mouth are small, with flat round teeth in front and no teeth in the back. The front legs of zhenlong are shorter than the rear legs. Each foot has five toes, one of which has claws. The earthquake dragon walks on four feet and walks very slowly. They live in groups. Zhenlong is a herbivore. When eating, Zhenlong swallowed all the leaves without chewing. Seismosaurus is a kind of dinosaur, but some scientists believe that the dinosaur fossils found belong to an oversized Liang Long. It was once recognized that the longest dinosaur was zhenlong.

The next one is a long-necked dragon living in the sea. Tanystropheus is a reptile that lived in the Middle Triassic, and its length is about 6 meters (20 feet). The main feature is an extremely long neck, which is as long as 3 meters (10 feet), which is longer than the body and tail combined. Although the neck is so long, it has only 12 vertebrae, and each vertebra is quite long. Fossils of long-necked dragons have been found in Europe and the Middle East.

Many complete specimens of sauropod larvae were found in the Besano formation in Italy, and the geological age was Latin period of Middle Triassic, about 232 million years ago. The common name of long-necked dragon means "long spine"

The first time I saw dinosaurs was in the cartoon Blue Cat and Dragon Knight. The dinosaur inside is called Tyrannosaurus Rex. When Tyrannosaurus rex appeared in front of my eyes, I felt that he was very shocked. It has a loud roar and a tall figure, maybe as high as two floors. Its mouth is called the "ultimate bone crusher", its teeth are very sharp, and its tail is another biting force.

Because I was very interested in it, I went to the encyclopedia and found that Tyrannosaurus Rex was a member of the Time Dragon family. Tyrannosaurus rex's brain is the largest and most powerful of all dinosaurs. No wonder it has such a big maw! Tyrannosaurus Rex is the "king of battle". They like fighting with other animals and their companions. Oh! It has so much combat experience, no wonder its fighting capacity is so strong, which is why I like it. I think it must be a great disaster to make dinosaurs extinct, otherwise dinosaurs as powerful as Tyrannosaurus Rex would not be so easily defeated.

The explanation of dinosaurs 5 dinosaurs used to be giants on the earth, but it was about 1. Mysteriously disappeared 600 million years ago, leaving only some bones called "fossils".

There are many kinds of dinosaurs, which are basically divided into two categories: one is herbivorous and the other is carnivorous. To my surprise, Lei Long, Liang Long, Triceratops and Stegosaurus who ate grass were not as fragile as I thought. They have self-defense weapons, with horns on the triangular faucet and thorns on the stegosaurus. Of course, Lei Long and Liang Long can't defend themselves, but they can use their tall bodies to resist predators.

Tyrannosaurus Rex: Also known as Tyrannosaurus Rex, it is a fierce large carnivore. Adult Tyrannosaurus rex can reach 13 meters from head to tail and weigh 9 tons. The biggest feature of its appearance is its tail, which is long and thick, and its hind limbs and tail muscles are quite strong. The forelimbs are relatively small, and the overall destructive power is stronger than that of tornadoes. Tyrannosaurus rex usually preys on large herbivorous dinosaurs and other small animals.

Lei Long: It's very high. It looks like lightning from the sky. Tyrannosaurus rex is estimated to have a body size of 22 meters and a weight of 65,438+05 tons. In front of it is a mini.

Male dinosaurs often fight for female dinosaurs. Generally, dinosaurs can live for several years or even decades, and a few can live for a hundred years. Tyrannosaurus rex put its eggs in the soil to keep warm. If it rains, it will dig a small hole next to the soil to let the water flow out and keep the soil dry.

One day in history, an asteroid hit the earth, which may have caused a chain reaction between the climate and the environment on the earth at that time, leading to the extinction of dinosaurs. I hope scientists can solve the mystery of dinosaur extinction as soon as possible.

On Friday, Professor Li from China Academy of Sciences explained a lot about dinosaurs to us. If you want to know about dinosaurs, you might as well read my following article first!

Speaking of dinosaurs, we have to start with dinosaur eggs! More than 20,000 dinosaur eggs were found in Henan Province, China. In our hometown-Dongyang, Zhejiang, there are many dinosaur eggs, about 15000. Dongyang is also known as the "hometown of dinosaurs" because many dinosaur fossils in Zhejiang originated near Dongyang. China has unearthed many dinosaur eggs, so the country applied for the Guinness Book of Records!

Dinosaurs are not only diverse, but also varied in size. Do you know what the biggest dinosaur is? Some people will say zhenlong, some people will say Argentinean dragon, and some people will say fragile double-cavity dragon? Actually, it is not! According to our professor Li's investigation, the largest dinosaur fossil we have found at present is the giant Ruyanglong, which is 38 meters long! As for the fragile double-cavity dragon, it is because the printing quality was not high in the past, and I don't know which link went wrong, so it became a dragon 60 or 80 meters long. So, do you know the name of the smallest dinosaur? Haha, it's a squirrel dragon. Its body is only 10 to 20 cm long, which is really about the size of a mouse. No wonder it's called "Rat Dragon". The big one is 38 meters long and the small one is only 10 cm. What a big difference in size between dinosaurs!

Since there were so many dinosaurs and they were so big, why did they become extinct later? Professor Li told us a funny reasoning: it is said that dinosaur teeth were barbed and could not chew food, so they could only be replaced by stomach stones. However, the chewing effect of gastrolith replacement is not good, so dinosaurs often have bloating and indigestion. You fart after indigestion, so many dinosaurs fart a lot. And fart! In fact, a large number of toxins, after being put into the air, destroyed the ozone layer that can block cosmic rays. Then, cosmic rays killed plants and dried up fresh water, so the food chain of dinosaurs was broken and dinosaurs could not survive. Another kind of reasoning is that volcanoes erupted frequently at that time, and a lot of dust rose into the sky, making the whole earth red, blocking the sun's irradiation, causing plants to die, and the surface temperature dropped rapidly, so dinosaurs died of hunger and cold. Of course, there are many other theories, such as Mars hitting the earth and dinosaurs stealing dinosaur eggs from each other ... Alas, why this dinosaur became extinct is still a mystery.

Explanation of dinosaurs 7 The biggest dinosaur I saw on TV was Zhenlong, a herbivore, with a length of 39 to 52 meters! The height can reach 18 meters! ! The weight reaches 130 tons! ! ! In other words, if two or three dragons are connected end to end, they can row from one door of the football field to another. If such a heavy behemoth walks on the leaf, the earth will tremble every time its giant feet step on the ground, just like an earthquake. This is the name of Zhenlong.

They like to live in groups, have long necks and can eat leaves from trees. The closest thing is that dinosaurs could not adapt to the changes in the environment (climate) at that time, so they became extinct.

The explanation of dinosaur 8 was actually as early as the19th century. Scientists noticed the similarities between dinosaurs and birds, so there was a hypothesis that "birds evolved from dinosaurs". However, scientists have been unable to prove their theory, and it was not until dinosaur fossils with feathers were discovered that this theory had strong evidence. Let's follow the theory of scientists to explore the evolution of dinosaurs!

First of all, scientists believe that 1 dinosaurs appeared on the earth 230 million years ago. After tens of millions of years of reproduction, the dinosaur family has become extremely large. Secondly, some carnivorous dinosaurs in the dinosaur family have evolved more and more like birds. Some of them may have moved to trees to survive in order to avoid enemies or find food, and gradually learned to jump and land. After a long time, they learned to use the buoyancy of the air to float from a tall tree to the air for a distance-gliding.

Finally, after a long period of exercise, they finally learned to fly, so they flew in the blue sky like birds.

Explanation of dinosaurs 9 Do you know what dinosaurs are? Dinosaur is an animal that lived about 235 million to 65 million years ago and could walk upright on its hind legs. They have ruled the global terrestrial ecosystem for more than 654.38 million+600 million years. Most dinosaurs have been extinct, but the descendants of dinosaurs-birds have survived and multiplied to this day.

Edmonton Ankylosaurus is a kind of Ankylosaurus. The following is a brief introduction to it: Edmonton Ankylosaurus wears heavy nails and a block deck to protect itself. There are also some bone plates connected together like puzzles on its head to protect the triangular head. In addition to this thick layer of heavy armor, Edmonton Ankylosaurus has another way to protect itself. On both sides of its body, there are a row of sharp bone spurs, which makes it have a prickly edge extending to both sides. When it is attacked, it is likely to crawl on the ground to protect its soft belly without a deck.

Pterosaurs, dinosaurs occupying the sky. It is one of my favorite dinosaurs. Introduction: Pterosaur, which means "winged lizard" in Greek, is an evolutionary branch of flying reptiles. They lived from the late Triassic to the late Cretaceous, about 228 million to 65 million years ago. Pterosaur was the first vertebrate to fly. Their wings are thin films made of skin, muscles and other soft tissues, extending from the chest to the extremely long fourth finger. Early species had long jaws and long tails that covered teeth; Later species greatly shortened their tails and lacked teeth. Pterosaurs vary greatly in size, from forest pterosaurs as small as birds to creatures that have appeared on earth, such as Fengshen pterosaurs and Hazgo pterosaurs.

Here's Megalodon. Megalodon was the earliest dinosaur found, but it lived in Jurassic. As early as 1677, an English priest described its broken bones. Unfortunately, the priest didn't know what animal would have such a big bone, so he described it as the remains of a "giant". It was not until 1823 that the jaws and teeth of the same animal were discovered, which was scientifically described by william baker, a British geological paleontologist, and named "Megalodon".

Finally, stegosaurus. Introduction: Stegosaurus is not an easy guy to deal with, although it is not big. This bipedal herbivore comes from an unusual dinosaur family: the pachycephalosaurus family is characterized by a thick and round skull. It is semi-circular and consists of many small bone pieces, covering its eyes and back neck. This skull was not very thick when stegosaurus was born. The dragon grows bigger and bigger, and it grows thicker and thicker. Some experts believe that they have found the skull of male stegosaurus and the fossil of female stegosaurus respectively. They found that some stegosaurus skulls were thicker than others, and these thicker bones may have come from male stegosaurus. The skull of a male stegosaurus can reach 6 cm-enough for half a brick. Stegosaurus's skull is five times as thick as human skull, and it is still a powerful weapon against fierce enemies. The way a stegosaurus defends itself is really scary! Most attackers can't stand such a violent impact. They either broke a rib or a leg.

Dinosaur Description 10 Dinosaur is one of the most concerned and loved beasts. Dinosaurs are very powerful. They used to be the largest animals on earth.

Dinosaurs are divided into two categories: carnivorous and herbivorous. Carnivorous dinosaurs had very sharp teeth, which made it easy for them to kill their prey quickly. Herbivorous dinosaurs ate grass, leaves, etc. You don't need sharp fangs. So the general dinosaur food chain is carnivorous and herbivorous.

Among so many species, my favorite is Tyrannosaurus Rex, whose body length can reach 13. 7 meters, weighing about 7-8 tons, hip height nearly 5. 2 meters. The blood basin of Tyrannosaurus rex is about 1 wide after opening. It is 3 meters long and has 60 teeth, each of which is 30 centimeters long. It crosses each other like handfuls of daggers and can bite through the bones of its prey.

Tyrannosaurus rex has a strong body and hind legs, and strong hind legs can kick its prey to death. But its forelimbs have degenerated, leaving only 1 meter. It is speculated that it sacrifices the weight of its forelimbs to support itself, so as to have a bigger mouth and head, thus maintaining the balance of its body. Tyrannosaurus rex has the habit of catching prey collectively. They surround their prey first, then pounce on it and bite its skin with dagger-like sharp teeth. Bite it to death and share the prey together. A huge living Liang Long will soon be left with only a white skeleton.

About millions of years later, a meteorite suddenly rushed to the earth from space and crashed directly into the earth. The earth was soon surrounded by orange-red flames and mushroom clouds. On land, dinosaurs fled in a hurry, but were buried by rocks, mud and sand that came out of nowhere, drowned by floods and fires, and burned to death ... dinosaurs became extinct.

However, the above reasons are just speculation. The real cause of dinosaur extinction has not been completely solved. I hope people can solve this unsolved mystery as soon as possible.

Dinosaur caption 1 1 Whenever I see the Encyclopedia of Dinosaurs for Children, I can't help but open it and never get tired of reading it. That's because the dinosaur's huge body, sharp teeth or lithe body attracted my attention.

Dinosaurs are giant animals that lived more than 60,000 years ago and ruled the earth for more than 654.38 billion years. Their bodies are huge, up to 20 to 23 meters. Some dinosaurs have very small forelimbs and can only stand and walk, such as raptors; Some dinosaurs had longer forelimbs, so they could walk on all fours.

Some dinosaurs were very docile. They will take care of Xiaolong wholeheartedly. There are also some dinosaurs eating leaves freely under the tree. They are usually vegetarian dinosaurs. As long as they are not disturbed, they will not be angry. However, those ferocious carnivorous dinosaurs would not be so accommodating. As soon as they see other animals, they will pounce mercilessly, then open their mouths and tear each other's meat.

Dinosaurs are divided into two types, one is carnivorous dragon and the other is herbivorous dinosaur. The most representative carnivore is Tyrannosaurus Rex. They are about 15 to 18 meters high. When they attack each other, they will hurt each other with long teeth or sharp claws. They also eat left-behind dinosaurs, and when they are very hungry, they also eat carrion from other dinosaurs.

Generally, herbivorous dinosaurs only ate leaves of plants. If they meet a tree that is too high, they will stick their forelimbs into the crown to form a standing shape, and then lean their heads on it to eat leaves. They don't run fast enough to avoid predators in time.

Now that dinosaurs are completely extinct, archaeologists have found many dinosaur fossils. According to this book, a very large skeleton of Tyrannosaurus rex was found in Europe. What would the world be like if dinosaurs still existed?

Description of dinosaurs 12 I like dinosaurs very much. I am a standard dinosaur fan, and I like to know all the information about dinosaurs from books.

Dinosaurs are divided into two types, carnivorous or herbivorous. To distinguish them, just remember that carnivorous dinosaurs walked on two legs like humans, while herbivorous dinosaurs were quadrupeds.

If you want to say the longest dinosaur, it must be a fragile double-chambered dragon. They are longer than whales, with an average body length of 35 meters, the longest 60 meters to 80 meters, the heaviest 220 tons, and the height between 14 meters and 16 meters.

The smallest dinosaur, Slender Dragon, deserved it. It is less than one meter long and weighs about 0. 83 to 3. Five kilos. Although it is small, it runs very fast.

Tell me about the predation of carnivorous dinosaurs. Take micrognathia as an example. It likes to hunt in groups, always pay attention to its opponents, and then attack when its prey is unprepared or exhausted. Besides odontosaurus, odontosaurus was the cleverest dinosaur among dinosaurs. Their attacks are planned and coordinated, and the division of labor is clear when attacking.

In the dinosaur world, it is also the law of the jungle, so herbivores must have self-defense weapons. Like Stegosaurus, it has four tail spines with a length of 1 m at the end of its tail, which can stab carnivorous dinosaurs. Lei Long is the largest sauropods, with two spear-shaped horns on its head and an angle between its eyes and nostrils. Such a sharp weapon can scare away carnivorous dinosaurs.

Dinosaurs flourished for a while, but in the end they became extinct. There are many theories about the extinction of dinosaurs, including meteorite collision, comet collision, orogeny, climate change and volcanic eruption.

When I grow up, I will also work with scientists to find out the reasons for the extinction of dinosaurs and solve this world problem.