I discovered the secret theme composition of nature.

I believe that everyone has written a composition, especially a topic composition, which is one of the main types of learning composition. Topic composition is an article that focuses on a given topic and selects materials around this central content. Then how to write this type of composition well? The following is the composition (General 14) that I helped you organize. Welcome to reading. I hope you will like it.

I discovered the secret topic of nature. It's a sunny Sunday morning. After I finished my homework and had nothing to do, I went downstairs and caught some snails to observe.

In the thick grass, I searched and finally found two or three fat and strong snails. I picked one at random and put it on the ground for careful observation. I found that when the snail got up, it was laborious, and there was always a layer of transparent mucus on the ground. Driven by curiosity, I touched the mucus. Suddenly, I felt a little sick and cried, "That's disgusting!" "I'll wipe the mucus off my hands soon. Suddenly, a novel idea came to my mind: why not let the snail race with me?

I gently put the snail on the clearing and drew a track there with chalk. "Are you ready ... run!"

In order to let it catch up with me, I slowed down a little, thinking: now it should catch up with me. I ran to the finish line and cheered happily: "I won, I won!" " "At first glance, the snail is still slowly starting at the starting line. I was so disappointed that I gave it a hard look. However, when I saw it approaching step by step, I couldn't help being moved by its persistent spirit. I'm thinking: if only everyone could learn from it.

When I got home, I turned on my computer and checked about "Why do snails crawl so slowly?" It says that when a snail crawls, it has protruding particles in its abdomen, so it crawls very slowly.

Nature is wonderful. If I have time, I will find more secrets!

I discovered the secret topic of nature. In the eyes of people who love life, the world is beautiful People who love to observe and think will make new discoveries every moment. So I found the secret of nature in this seemingly dull life.

Spring is the season when grass grows and warblers fly and everything grows. Grandma and I listen to stories in beautiful spring. By chance, I found two extremely beautiful leaves on the roadside. On the dark green leaves, there is a touch of white regularly. It is not so much a leaf as a finely crafted work of art.

Grandma gently picked them up, dusted them off and put them in a small bag.

I asked curiously, "grandma, what shall we do with them?" Bookmarks? Make a specimen? " "No,no." Grandma smiled and shook her head. Then he leaned down and mysteriously said to me, "Let's go home and plant!" ""what? Leaves can also be planted? "I'm surprised!" You'll know when you get home. "Grandma and I sold it.

Back home, grandma found a beautiful flowerpot, beat the soil in the flowerpot very finely with a shovel, and then spread the soil in the flowerpot. Then she took out two leaves, planted them carefully in a flowerpot, compacted the soil around the leaves with a shovel, sprinkled some water, and then put them in the yard for careful study.

Later, every few days, we will look at these two leaves to see if they are still alive. But every time the leaves don't move, which makes me disappointed. I told my grandmother what I observed, and my grandmother told me, "As long as the leaves are not rotten, they are not dead."

So I sat still, and a week later, the leaves stood up. I am so happy that I take care of them more carefully. In my expectation, many thin white beards grew under the leaves. Soon, many green spots appeared below.

Up to now, they have grown into two bonsai plants. Grandma told me: "In nature, many plants grow by cutting." They are generally very energetic. "

This incident told me the secrets of nature, and also told me that life is full of secrets as long as you pay attention to observation.

I discovered the secret topic of nature. Composition 3 This noon, after lunch. Seeing that grandma took some leftovers to feed the ducks, I found a dozen bones of the fish I ate today. So, I ran to my grandmother and said, "Grandma, there are fishbones in this duck food!" " "Grandma just squinted and smiled. He touched my head and said kindly, "Tim, Tim, it's all right." "Ducks have a solution. I'm thinking! So I decided to do a survey. I secretly ran to a big stone behind the duck restaurant (where ducks eat, where people eat is called canteen, and where ducks eat is called duck restaurant). Sneak up on ducks. The ducks didn't find me. They swaggered to the food bowl and competed for food.

A duck is holding a green vegetable with a small thorn, and my eyes are fixed on the duck. Look, it secretes water from its flat mouth with a kind of saliva. As long as the ducks eat the food, the water will melt the thorns. Then, the duck can successfully complete the victory that he bravely grabbed. It turns out that ducks don't get their food for nothing. They have to compete with their relatives to get their food. Today, I understand that ducks use water in their mouths to make thorns disappear.

Unexpectedly, every place, every place and everything in nature has secrets!

I discovered the secret topic of nature. Composition 4 Nature is a good friend of mankind. Humans observed and were inspired by nature and invented many things. For example, observing the eagle's eyes invented the eagle's eye, the fish swimming in the water invented the submarine, the rocket took off by using the recoil principle of jellyfish and squid, studied the chameleon's color-changing ability to develop military camouflage equipment, studied the frog's electronic frog's eye, studied the "hot eye" function of poisonous snakes, invented the miniature thermal sensor, and studied the sawtooth on a blade of grass to invent the saw. I watched dragonflies today. Humans studied dragonflies and invented helicopters. Dragonflies can generate local unstable airflow different from the surrounding atmosphere through the vibration of their wings, and use the vortex generated by the airflow to lift themselves up. Dragonflies can soar under small thrust. They can not only fly forward, but also fly backward and left and right. They can fly forward at a speed of 72 kilometers per hour. In addition, the flying behavior of dragonflies is simple, with only two wings flapping constantly.

Scientists have carefully studied the principle of dragonfly flight, uncovered the secret of dragonfly flight and invented the helicopter. So the helicopter we see now can not only fly back and forth, but also fly left and right, and the flight speed is greatly improved. I also know several proverbs about dragonflies: dragonflies fly low, and there is no wind or rain; Dragonflies are high, sunburned, dragonflies are low, and rain fans are fascinated; Dragonflies fly low and go out with hemp fibers; Dragonflies fly in groups, and it's going to rain heavily.

Nature has inspired many people to invent many things. Nature is really a good teacher for human beings!

I discovered the secret topic of nature. There are many secrets in nature, which can only be discovered after many experiments and practices. In this way, I discovered the secret of apple discoloration.

On this day, I came home and found a guest in our house. I peeled an apple for my guest. Who knows, the guest forgot to eat. When I sent the guests away, I was surprised to find that the apple had turned yellow. Why do apples turn brown? The problem snowballed in my mind. I decided to ask my father. I asked him inexplicably, "Dad, Dad, why do apples turn brown?" My father looked away from the computer screen and said kindly to me, "Little darling, let's do an experiment!" " "

Dad took a big round apple and cut it into three pieces. The first piece is in a bowl, the second piece is in a bowl with a glass cover, and the third piece is in salt water. What are you doing at this time? Dad seemed to see through my mind and said mysteriously, "You will know later." After a while, I can't wait to have a look. The first apple is brown, the second apple is a little light brown, and the third apple is the same as before. I took a bite, wow! What a beautiful day! It's really cool Before my father could speak, I said to my father, "Dad, why?" Dad gave a dry cough and said, "Because there is a substance called enzyme in the apple, it will become oxidase when it meets oxygen, which will make the apple discolor."

I went on to say, "and covering the lid will reduce the connection between the apple and oxygen and make the apple slightly discolored." Right, dad? ""that's right. " "But why doesn't it change color in salt water?" "Because salt water completely prevents apples from being dissolved by oxygen, and salt will stimulate the sweetness of apples and make them sweet. So salt and all kinds of fruits are husband and wife. " Dad replied humorously, "So that's it!" I nodded involuntarily.

It seems that the first half of the sentence "there is learning everywhere, and three people must learn from each other's strengths" is really right! It seems that I will observe things around me more attentively in the future.

I discovered the secret topic of nature. Composition 6 Nature is full of wonders and hides many secrets. No, I found another secret.

I have a lovely kitten at home, all white, as if wearing a white sweater. Keen ears, always be alert. Two eyes are like two black gems, and that long thin tail is so cute when walking.

I thought it was nothing special, but once, it opened my eyes. We went to grandma's house during the Spring Festival and brought it with us. It sits comfortably on the railing on the second floor. Just then, a little brother suddenly stood behind and shouted. This time, it was frightened, only to see its body trembling, and my heart suddenly hung high for fear that it would fall. I'm really afraid of what will happen next. It jumped off the railing on the second floor, and my heart almost jumped out! I can't help covering my eyes at the thought of the bloody scene. "Meow ..." What's that noise? When I opened my eyes, it stood safely downstairs, shook its paws and left as if nothing had happened. Why is the kitten okay? I rubbed my eyes and looked again. It's true! I was stunned by what I saw. No, I have to find out.

I don't know. I don't know. I was shocked when I checked. It turns out that the kitten has a secret weapon. Its tail can help it adjust its posture and keep its balance. In addition, its claws have thick meat pads, which can reduce its impact, so the kitten will not be injured if it falls from a place that is not too high.

Another time, I got up in the middle of the night to go to the bathroom. I heard something moving in the kitchen, and my heart tightened. I thought: it can't be a thief! My heart is racing. I went into the kitchen and there was no sound. The stone hanging in my heart fell to the ground. Just as I was about to leave the kitchen, I found two bright spots in the corner! My heart almost jumped out and I stood there in a dilemma. "Meow!" Kitten? When I turned on the light, it was it. It turned out that this greedy kitten knocked over the trash can. But what are these two highlights? I went back to my room to look for information. It turns out that there is a reflective film behind the kitten's eyeball, which can collect the light and refract it out, so that the kitten can see clearly at night and become two small bright spots, like two night pearls.

Nature is a book with infinite secrets that you can't finish reading!

I discovered the secret topic of nature. What's the secret of nature? Maybe you have asked many people, and they are all vague. Then explore for yourself and let nature tell you in person.

When you explore deep in the forest, you will find green towering trees, low thorny bushes and soft and thick old leaves. Delicate flowers are parasitic on the tall branches, dancing like colorful butterflies in the breeze.

The cool stream flows down the hillside with the fragrance of wild flowers on the edge of the forest. Monkeys are naughty and playful like children, and orioles and many unknown birds crow happily, as if it were a chorus of nature. The children came to the stream and ran happily with the hare. When they were tired of running, they snuggled up to the small animals and leaned against the sunny hillside, quietly listening to Grandma Feng's story.

Are these all of nature? No.-Of course not!

When you put on a diving suit and wander in the depths of the sea, you will find that colorful corals are so wonderful. In the gentle water waves, those colorful corals that you pity are swaying their slender bodies gently and softly. Colorful schools of fish are chasing through the corals, enjoying the rich treasures endowed by nature to the ocean.

There are also groups of smart and lively dolphins, happily spitting a string of bubbles at each other; Parrotfish tirelessly build sand castles; Long and smooth moray eels sleep leisurely. There is also ... the boundless ocean embraces the huge biological chain endowed by nature, which provides rich life energy for human beings.

When you fly and overlook this mysterious volcano from high altitude, you will still feel the threat of hot magma wrapped in huge energy and rolling down in an avalanche from thousands of miles away. When the volcano erupts, it is the roar of the earth, the roar from nature!

What are the secrets of nature? It is waiting for us to continue to explore.

I discovered the secret topic of nature. Nature is really colorful, with beautiful and exquisite flowers, butterflies flying in the air and hardworking and lovely bees, among which I am very interested in leaves.

Take a walk in the community in the morning, and your shoelaces will be loose when you walk. I quickly squatted down to tie my shoelaces. Suddenly a leaf fell from the tree. I picked it up gently and sat on the stone bench to observe it carefully. I touched it, and both sides were smooth, the back color was lighter, and the front color was darker. I found that there are veins on the leaves, the thickest in the middle is the main vein, the two sides of the main vein are lateral veins, and the branches of the lateral veins are veinlets. I continued to observe carefully, and suddenly, a huge question mark appeared in my mind, and I thought to myself: What is the function of the veins of leaves?

I'm confused. Pick up the leaves and run home, immediately pick up my mother's mobile phone and search for the functions of the leaves. I waited for the answer excitedly, and after reading the answer, I suddenly realized. It turns out that veins are not just like our blood vessels. The roots of plants absorb water and nutrients from the soil, and then transport them to all parts of the leaves through veins to ensure the demand for nutrients by plants and the nutrients needed for plant growth and development. In addition, veins also play an important role, which is similar to human bones.

It turns out that nature has so many secrets. I will observe nature more in the future.

I discovered the secret topic of nature. Nature has so many secrets! Ants move the house higher, and earthworms seal the hole, which indicates that it will rain soon; Most of the fish float and turn white, and dragonflies can't fly in groups on the windows, which indicates that the earthquake is coming ... Recently, I also discovered a secret: spiders pull nets to catch mosquitoes, which indicates that the weather will clear up. On the contrary, the spider drags the net and it's going to rain.

Why do spiders forecast the weather? After consulting the information, I finally found the answer. It turns out that there are many small spinnerets on the spider's tail. These little spinnerets are sticky and cold. Whenever rainy days come, due to the high air humidity and a lot of water vapor, these water vapor can easily condense into small drops on the spider's spinneret. In this way, when the spider spins, these small water droplets prevent the spider from spinning, so the spider feels difficult when spinning, so it stops spinning and closes the net. On the contrary, when the weather turns fine and the air humidity becomes smaller, spiders can spin silk, open webs and catch insects smoothly without the interference of small water droplets. Seeing this, I suddenly understood why spiders predict the weather. However, I still want to know if spiders have other ways to predict the weather. So, I consulted all kinds of materials and learned that spiders also have a way to predict sunny days! According to scientists, spiders' legs can feel sounds with a frequency of 20-50 Hz. When the weather is clear, many insects like to go out for activities, and the "buzzing" sound made by insects when flying will soon be discovered by spiders, so they are ready to add silk and make webs to capture those "delicious" that meet their own tastes.

Only after consulting the information did I know that there were too many secrets of nature. I believe that as long as we pay attention to nature, we will discover many secrets and gain more knowledge.

I discovered the secret topic of nature. We live in nature, but nature has many secrets. For example, why can't raw eggs rotate three-dimensionally like cooked eggs? Why can't we use up the oxygen we breathe? ……

We can't use up the oxygen in our life just because there are flowers and trees that absorb carbon dioxide in the air and then use photosynthesis to produce oxygen to make the air fresher.

Why not? Take the middle section of the willow branch and insert it in a sunny clearing on the roadside, and the willow branch will grow into a dense willow tree. Just a force of life. It is also because willow has a good personality that she can survive anywhere. Just like us humans, no matter where you are sent to work, you can do well.

Why can't fish live on land, but in water? That's because fish breathe with gills and we humans breathe with lungs, so fish can't leave anyone. Similarly, if we go into the water without oxygen, we will suffocate.

Nature is like a big textbook. As long as you study it carefully, you will have different gains and discoveries. Therefore, at the same time, we should do a good job in protecting nature, not polluting and destroying the environment, and not deforestation. If trees are cut down wantonly, there will be no fresh air on the earth.

We want everyone to understand that destroying nature is complete suicide! If you wantonly destroy nature, you will be punished by nature!

If you want to get secrets and laws from nature, you must first know how to protect nature!

I discovered the secret topic of nature+1 1 There are many amazing things in the world. As long as we observe carefully and explore more, we will continue to find something.

Let me tell you what I found: the secret of nature all year round.

I find that spring is colorful. Everything has been brewing for a winter, spring is blooming, and the gentle blue sky has begun to make noise. Groups of beautiful birds fly freely in the boundless sky with colorful kites. Beautiful flowers are in full bloom; Lovely grass nodded frequently; Tall trees beckon to spring.

I find summer full of passion. The fiery red sun enthusiastically sprinkled warm sunshine on everything, and people took off their thick clothes. Ants are carrying grain diligently. Begonia, lilacs, peach trees, pear trees and apple trees are all scrambling to open, and birds and flowers are everywhere.

I find autumn very charming. With the gradually cool wind, autumn came quietly. The leaves on the tree began to fall with the wind, as if the tree were mercilessly abandoning the defects in its beautiful crown like jasper, making its dress more gorgeous and attractive, and the tree began to mature from coquettish adolescence.

I found that winter was wrapped in silver. Pieces of glittering and translucent snowflakes fell from the sky. Trees, mountains, houses and the earth are all covered with white clothes, and there is ice and snow everywhere. Many animals have begun to hibernate, but winter is not lonely. Groups of children came out to play. They run and jump, make snowmen and have snowball fights ... which adds a little excitement to winter.

Nature circulates alternately throughout the year, and each season has its own unique scenery. As long as you observe carefully, you will find its infinite charm and secret!

I found the secret topic of nature composition 12 The little gecko looks a bit like a lizard. Its body is very long, covered with mottled patterns, with a long back bar behind it and four legs below. Its four claws cling to the wall like four small suckers.

"Pa" a clear voice reached my ears, I suddenly turned around, turned on the light, squatted down and searched carefully. Not far away, there is a little thing moving. Looking intently, it turned out to be a little gecko. Hey, I got it! I gently moved my foot, surrounded it with my hands first, and then grabbed it. "Ha ha, I finally caught it!" "The gecko was frightened by this grasp, and its limbs were pushed hard, its mouth was round, its tongue was long, and it spit from time to time, and it looked very scared. I quickly put it in a transparent bottle. After a while, it trembled and made an escape plan. It kept jumping up, with a bulging back and a tired little heart jumping out!

I know gecko is an expert in catching mosquitoes. Suddenly, an idea flashed through my mind ... I went to the wall to shoot a mosquito and threw it into the bottle. I didn't expect the gecko's agility to be so high, and the fear suddenly vanished. I suddenly opened its "maw" and stuck out its amazing tongue to drag mosquitoes into its mouth. Mosquitoes suddenly became a good meal for geckos, and then I saw the fierce side of the little gecko.

"Gecko is good for human beings, so let it go!" Dad's voice came from behind. I thought for a moment and let the gecko out of the bottle. It seems to burp and climb into the corner in fear. Who knows, a ride-mom, accidentally stepped on its tail. I thought it would die, but just as I reached out to touch it, it climbed up the wall. I thought it was strange, so I asked my mother. It turns out that this is a gecko's escape trick. If the enemy grabs its tail, the gecko will break its tail and confuse the enemy to escape quickly.

I didn't expect such a big secret to be hidden in the little gecko. Nature is really mysterious!

I discovered the secret topic of nature. I found a pine cone. Look, the lovely pine cone tightens its taupe coat and looks slender, like a sleeping baby. It was so cute that I picked it up and put it on the porch at home.

I will observe pinecones carefully every day. A few days later, I was surprised to find that the pine cone seemed to be much bigger. A week later, the hidden part of the pine cone was completely unfolded.

Why do pinecones swell by themselves? What is the reason? I asked my mother curiously. My mother thought about it and said in an uncertain tone, "That's the reason why heat expands and cold contracts." I asked with a grain of salt, "Mom, will the pinecones shrink?" As a result, my mother was speechless by my question. Forget it, I won't embarrass my mother. I decided to prove my guess with experiments.

I picked up the pine cone, turned on the tap and carefully cleaned every part of the pine cone. In order to keep the pinecones moist and not too cold, I drained the water and put the pinecones in a damp and warm place. Then, I began to wait quietly for the experimental results.

Five minutes later, the scales of the pinecone began to bend slightly inward, and the shape of the prickly side gradually elongated. After more than ten minutes, the pine cone scales were completely shrunk together under the drive of moisture, and there was no trace of opening at all.

I looked up a lot of information and argued with my mother before I came to the conclusion that the internal structure of pine cones is different from other plants and is particularly sensitive to the humidity of the surrounding environment. Pine cone expansion represents dry climate, and contraction represents humid air. Experienced people also call pinecones "weathermen". Oh, it turns out that pine cone contraction is also related to natural phenomena such as swallows flying low, which is a sign of rain.

I discovered the secret topic of nature. I found that nature has many secrets. For example, when it rains, swallows will fly low; Ants can move; Another example: dogs stick out their tongues to cool off in summer ... Recently, I discovered a secret of nature.

In the past few weeks, grandma's family and neighbors have been worried about the poor growth of banyan trees. Some people say that there is only one tree left, and the rest are cut down. The banyan tree will grow as long as possible, and we have no choice but to do it by our two families. When chopping, grandma was heartbroken to death-in fact, this is not surprising. After all, she is a standard cheapskate. Grandma touched this side for a while and looked at it for a while-"Why not just cut down some trees?" Grandma looked at the banyan tree affectionately. "If not, wouldn't it be a loss?" What grandma said, the whole family dare not violate it. Dad sighed, raised his axe and cut down several thin banyan trees. Swish, swish, five or six banyan trees fell instantly, and dad was about to continue. Unexpectedly, grandma suddenly rushed to protect the remaining banyan trees. "Oh, don't cut them!" All right, whatever you say. Dad sighed again and put down the axe.

I felt bored, so I ran to my neighbor's house, only to find the neighbor's yard in a mess. The banyan trees on the ground startled me, and then I looked at the place where banyan trees were planted. Only one tree is very slender! Has this place been looted by a typhoon? I smoked, but my neighbor smiled generously. It is estimated that the small banyan tree will die! I looked at the banyan tree with pity. When a gust of wind blows, it swings in the wind.

I went back to my grandmother's house yesterday and found that the little banyan tree was almost as tall as the neighbor's house! Where's grandma's Nothing has changed. I was surprised, but I was relieved soon. It is normal that a single banyan tree that absorbs natural nutrients grows faster than five or six banyan trees that absorb natural nutrients together!

Nature is our home, so we should know more about it. Feel it. Nature has many secrets waiting for us to discover.