In study, work or life, everyone has tried to write a composition, which can be divided into narrative, explanatory, practical and argumentative according to different genres. So, how to write a composition? The following are eight fourth-grade scientific compositions I collected for you. Welcome to reading. I hope you will like them.

I read the fourth grade scientific composition article 1 science herald when I was in the third grade. There are many contents in the newspaper that deeply attracted me, such as mystery exploration/Congcong laboratory and so on.

The first edition has the introduction of scientific and technological innovation/scientific and technological innovation figures. The above small inventions and small productions are all inconveniences for young authors in their lives, and then these young authors have finished them through careful thinking/production and constant revision. After reading their little inventions, I know that we can also make inventions. There is also a column called kaleidoscope, which introduces strange things that have happened in the vast world and let me know that the world is beautiful.

My favorite is the second edition of Mystery Exploration, which contains a lot of knowledge and mysteries about the universe. For example, today's stories are all about the moon, such as whether there is water on the moon, the clues of life on the moon, and the catastrophe on the moon, which makes me know a lot about the moon and surprises me that the universe is huge and endless, with endless mysteries waiting for us to discover and explore.

The third edition has columns such as art stories/little artists. The fifth edition is a fun science and technology museum, with eye-opening/science and technology exhibitions and stories of scientists, which let me know the stories of scientists and other great people who have succeeded with their wisdom and inspire me to work hard. There are little detectives/intelligent examination rooms/skilled DIY// try it and so on. In the intelligent lab, I can't put it down. It really made me think. There is also a new computer time and space. The little E-family/network new human/game zone above taught you a trick and made me understand a lot of computer knowledge. To tell the truth, even my dad loves to watch it. what do you think? Isn't the Science Herald good? I want to continue.

This Saturday night, I sat on the sofa and watched a documentary about the earthquake. Dad came back with a heavy-looking box in his hand. I asked my father curiously, "What's in this box?" My father said to me, "This is an earthquake simulator. We can use it to understand how the house collapsed in the earthquake and how to keep it from collapsing."

He sat on the sofa and suddenly asked me, "Yo-yo, can you build iron bars with magnets in these boxes into a house structure, so that they won't collapse in a magnitude 4 earthquake after being electrified?" I thought: What's so hard about this? It's just a simple earthquake of magnitude 4, and it won't collapse if you hold it casually. Without thinking about it, I put the shape of the house on a small platform connected to the power supply, then turned on the power supply and adjusted the vibration level to the normal mode of level 4. But the situation of the experiment was bigger than I expected, and the previous times completely collapsed. I wondered, thinking, how did this happen? Isn't this the structure of all houses? . I became cautious again and carefully built a more accurate model, but the result was exactly the same as the first time, and it collapsed again without a few shocks. My mood is like a deflated balloon, and my high mood immediately shrank back and kept saying to myself, what's the matter? Can't go wrong! In desperation, I can only ask my father for help. My father took down the eight iron bars I put on the roof one by one, put them into big forks in the following four aspects, and said to me, "Now let's have a look. Will it collapse? " When I first started doing the program, I didn't expect this model to be as reassuring and unmoved as before. After the earthquake, my father's model still stands on the platform. I was surprised and quickly asked my father: Dad, why did you put it like this, so that the structure built by these iron bars would not collapse? "Dad told me that the reason for this is that it can disperse gravity and prevent gravity from concentrating on a certain point. If gravity is concentrated at a certain point, it will cause pressure when it collapses, so the casualties will be even greater. "

I didn't expect such a small change, but it caused a huge change in the result. What a wonderful scientific world! Let's continue to explore together!

Get on the bus, and we set off. Everyone talked and laughed all the way, and before you know it, you reached the door of hubei university of arts and science.

We first visited the College of Chemical Engineering and Food Safety and Quality. The teacher took us into a laboratory. There are many sophisticated instruments in this laboratory. An elder sister showed us the microscope. Sister put the glass slide with the specimen under the microscope and the specimen appeared on the computer. I learned to pick a specimen of bee mouthparts and tried to see it with my eyes for the first time. It is almost invisible like sesame seeds, but when I put it under the microscope, dense fluff immediately appears on the computer. It's amazing!

After coming out of the lab, we are going to make cookies. A big sister showed it to us again. Sister stirred flour and sugar into mud, mixed with butter, printed stamps on it with her favorite mold, and baked it in the oven for fifteen minutes, and the cookies were baked. I made some biscuits like bears in the way of my elder sister. Although the cookies are hard to bake, I am still satisfied because I made them myself.

The assembled world is a boy's Garden of Eden, full of the mystery of magical castles and the unpredictability of foggy forests. This requires imagination and logical rules. Lego star diamond, robot DIY accessories and scientific tool accessories are all amazing, which will give you a big surprise if you are not careful. Let me talk about my science conference!

What I often do is Lego assembly. When I first came into contact with Lego assembled toys, my mother was very wary of the little star diamond, fearing that I might accidentally swallow it as candy. Actually, my mother doesn't understand that I prefer these small diamonds to candy. For a time, I was fascinated by building Lego City. I added many space passages between skyscrapers, strengthened the defense of wartime tribes, and built large amusement parks in coastal towns ... one after another, time flew like a bullet. I often get carried away and immerse myself in it. I feel like a great architect in Lego world, fighting for a happy home. Some people are very enthusiastic about Lego and think it is easy to assemble Lego, as long as you follow the instructions and use the software casually.

Spelling Lego is memory and patience. With the increasing number of star diamonds, it is a very challenging thing to find the administration you want in thousands of star diamonds. In the past two years, I am very proud. In the case of more and more heavy study, I also completed the assembly of Millennium Falcon and Death Star. The real charm of Lego is to assemble it according to your own imagination. I have spelled castles, farms, railway lines, deserts, sky cities, etc. Different from the instructions. The most interesting thing is to assemble with friends and compete with two armies or three armies. My job is to turn thousands of star diamonds into vivid and interesting stories, and it feels really great!

The most popular in our family is robot DIY assembly. DIY is self-assembly. I think it is a little more difficult than Lego assembly, because there is a lot of physical knowledge. Playing this fun project can get the unanimous support of parents. My first job was a robot dog. I needed wrenches, screwdrivers, vises and other tools, as well as wiring and debugging programs. It was very challenging for me when I was only 8 years old. My hands are not strong enough. Those screws are difficult to tighten. After many debugging, the puppy's four feet jumped out of harmony and fell down as soon as it started. I revised the instructions repeatedly and corrected my mistakes. When the puppy is really finished, that kind of happiness is unparalleled. After that, I think the outstanding works are six-legged car, automatic obstacle avoidance cleaning robot and physical experiment suit. I borrowed a book called Robot from the school library. There are many complicated robots in it, which are very capable. I really hope that one day I can become an engineer who makes super robots.

I think one that is very practical is the assembly of household appliances. The biggest piece of equipment I have completed so far is the astronomical telescope, which belongs to scientific tools. When I bought it from Taobao, it was a bunch of scattered lenses, brackets, screws and other parts. It was a bit difficult to read the assembly instructions, which cost me a lot of effort, and I also asked my uncle who had the same assembly experience in my circle of friends. However, it is really handsome after assembly. I took it to the balcony on the top floor for astronomical observation, and the surface of the moon I saw was uneven, which was completely different from what I saw with my naked eyes. According to the instructions, this astronomical telescope can also observe other planets and nebulae in the solar system, and can also take pictures and record them, but it needs lenses and other spare parts for assembly and upgrading. This assembly can not only learn scientific knowledge in the process of assembly, but also allow me to obtain better scientific observation records after completing my work. I also assembled daily necessities, my mother's shoe rack, my father's bookcase and my sister's little bike, all of which are my works. These labors have won full praise!

After reading so much, do you think scientific assembly is interesting? If you are interested, please join us!

It has been 20xx years now, and human science and technology have developed rapidly, and I have also become a famous scientist. I invented many things and applied them widely in my life. But I'm not satisfied. Now, I am working on what I have dreamed of owning since I was a child-flying machines.

Planes are very environmentally friendly, unlike cars that pollute the environment with exhaust gas. It uses the energy synthesized by carbon dioxide absorbed by itself and solar energy as energy to run. Unlike airplanes, airplanes can seat dozens or hundreds of people at a time. It can only sit one person at a time. It doesn't fly high, but it flies very fast, sometimes even faster than an airplane, and it is flexible and safe. If the road is crowded and the car can't move, but you will be late for work and school, the flying machine is your best choice. There is no need to squeeze people and cars on the ground. Enter where you want to go and the aircraft will walk.

Planes can also become robots to do housework. Take care of the children at home and go out to buy food. You can plant trees outdoors. This robot plants trees quickly and has a high survival rate! Put the water seedlings in a fixed mold and you can plant trees soon! There are many such robots in the desert, and the desert will soon become an oasis!

This is the plane and robot I invented!

Today, one thing makes me happy beyond description, because my mother and I are going to the science center that we have been waiting for for for a long time.

Along the way, we were in high spirits and always fantasized about the appearance of the science center. When we got off the bus, we were presented with a spectacular, majestic and very beautiful scene. It's totally different from what I expected. When we entered the science center, we saw rich and colorful scientific information.

We walked into the experimental discovery hall with excitement and expectation. When you enter the museum, the first thing you see is the high point of the Museum of Experiment and Discovery: the electromagnetic stage. A hostess said: "electromagnetism will make people feel creepy. Women with long hair can try it on stage." I saw that my mother's hair was very long, just like what the hostess said, so I asked my mother to try it on stage.

Miracle appeared, mother's hair really stood on end, so straight, as if she saw something terrible.

Then we came to the hall of perception and thinking, then came to the mirror maze, and entered the maze. Thousands of mirrors shine on us, which makes us see things in a blur and can't tell who is who. We walked left and right, but we couldn't get out of the maze. Once, we saw the exit, but more exits were reflected in the mirror.

Besides these, there are many interesting scientific phenomena. I will definitely go to the science center next time.

This afternoon, I finally had my favorite science class. After class, we listened to the teacher silently.

"Students, let's take a look. What's in the experimental plate? " The teacher asked. The students all raised their hands with great enthusiasm.

"All right, students in the first group, you answer this question."

"There are beakers, ping-pong balls and boxes in the experimental tray …" said the classmate.

"Let's put the experimental equipment in a basin filled with water and see what happens."

At this time, everyone began to do experiments. Our group put all kinds of experimental materials into the water. Finally, I opened the box and put a paper clip.

"Excuse me, what did you find?"

"Some objects sink to the bottom of the water, while others float on the water." The students answered in unison.

"Let's put aside the objects floating on the water. Everyone said, what is the object that sinks under the water? "

"There are glass balls, small bottles filled with water and plasticine."

"Let's see how to make plasticine float first." "You can make it into a boat." Some students scrambled to answer. "Well, let's give it a try." This time, two students in our group have been pinching, but they failed again and again. Later, the teacher said to put paper clips on the boat, and some groups actually put 12.

Then, the teacher said that this is the way to change the shape, and the teacher also explained the other three methods for us one by one: weight loss method, floating method, and adding salt to water to lose weight.

This is really a class where you can do experiments and learn a lot of knowledge. I will never forget this science lesson!

Last week, my mother bought me a small compass.

I turned the compass around and couldn't understand why its hands always pointed to the surface. In the evening, my father came back and saw me playing with a compass. He asked, "What's the matter?" I said, "Dad, why does the compass always point to the water?" Dad said, "The compass was invented by our ancestors. Our ancestors knew that magnets can absorb iron, so they made a compass that can move freely. " . Why can a compass point the way? It turns out that the earth is a very big magnet. Like a magnet, it has two poles, one is called geomagnetic North Pole and the other is called geomagnetic South Pole. Because the compass is a magnet, it can move, and the magnet is like-minded and opposites attract, so the compass on the earth always faces the geomagnetic north pole and the geomagnetic south pole. ""Oh, that's what it is. It's so interesting! " I said.

Dad also told me that the compass was one of the four great inventions in ancient China, and the earliest compass was called the compass. I asked my father, "So, how to use this compass?" Dad said, "put it flat, and then the pointer will rotate under the action of the geomagnetic field." When it stops, one end points to the south and the other end points to the north. " Compass is mainly used to tell the direction when the direction is unknown, but it can't be used in some places with unstable geomagnetic field, such as deserts and some canyons. "

Ships sailing on the sea and planes flying in the sky need compasses to point out the direction; When we travel to the suburbs, the compass will also bring us great help ... the compass is really our good helper!