Popular science expository composition

In daily study, work or life, many people sometimes write compositions. According to the characteristics of writing proposition, composition can be divided into propositional composition and non-propositional composition. What kind of composition can be called an excellent composition? The following are five popular science expositions I have compiled for you, hoping to help you.

Yesterday, the teacher took us to the gym to see an interesting popular science exhibition.

Walking into the gymnasium, I saw many strange sights. Hey, what's that? A faucet has been running out of water, but there is no water pipe connector. Only when I saw the introduction did I know that there was a transparent water pipe hidden in the water. Ah! It turns out that the water pipe is the water in the water supply faucet. This is the so-called "passive water".

My favorite is a mirage. I stood a meter away and looked ahead. There is a spring hanging in the air. I reached out to touch curiously, but I couldn't touch anything. That's a mirage!

I saw another big screen. There are many strange patterns on it. The most striking thing is that there are two people on a big head. It says below that this painting has nine faces. It is said that all they found were IQ 180. I am curious to see that () many teachers also come. Alas, I only found three faces. Our Chinese teacher Ma pointed to the back and soon found nine long faces. What a good teacher!

There are many interesting things. I stopped, talking and laughing all the way, watching my classmates touch the big microphone with their hands. Listen to the students playing the electronic piano "Mi Duo Mi"; Feeling the laughter of my classmates, I really gained a lot.

Reluctantly left, I think the progress of science is really fast, and it fascinates me more and more. Also let us know that some things should not be too superstitious. We should believe in science, which can lead us to explore many unknown secrets.

I think this popular science exhibition is very meaningful.

As long as you observe carefully, you will find that science is around us.

For example: Why do people leave? Why do bicycles and cars run? Why did the plane fly into the sky? Why does the sun shine? The sun is just a huge and boundless fireball, which is divided into core area, radiation area, convection area and surface area from the inside out. The surface layer is colored ball, light ball and corona. Where does the sun's light and heat come from? Oh! It turns out that there is a lot of hydrogen on the sun, and the nuclei of these hydrogen gases react constantly, just like hydrogen bombs explode constantly, so there is always light and heat. It takes 8 minutes and 9 seconds for the light from the sun to reach the earth.

Newton, Edison ... Many great scientists have been curious about everything since they were young, and they have done everything with great care. Therefore, each of our children has been studying every lesson carefully since childhood and carefully observing every little thing around us. In order to master more scientific knowledge.

Breakfast is the most important meal of the day. A good and healthy breakfast will make you energetic and devote yourself to your study and work.

What kind of breakfast is the best? First of all, it should not contain additives and synthetic ingredients, sugar and preservatives. Grain and milk are the best natural raw materials. They can provide you with nutritious protein, iron, calcium, dietary fiber and vitamins.

Porridge is China people's favorite breakfast. Breakfast cooked with millet, red beans, mung beans and nuts can meet people's needs for nutrients such as sugar, vitamins and dietary fiber. With an egg, a steamed stuffed bun or baked wheat cake, it is an excellent match for breakfast. Some people like to eat diced vegetables and fried dough sticks. These high-fat foods are not suitable for the elderly and children. Repeated use of edible oil at high temperature is easy to produce harmful substances and cause cancer. Alum or baking powder used to make fried dough sticks contains aluminum ions, which will make people's intelligence decline and cell aging, and accelerate aging. Drinking milk in the morning is very important for children. Milk is rich in calcium and milk protein, which can promote bone growth and intellectual development. Soybean isoflavone contained in soybean milk can delay aging, especially for women, because soybean isoflavone is a natural estrogen, which can make women young and beautiful forever. It is not good for children to drink soybean milk and eat fried dough sticks too much, which may lead to precocious puberty.

Breakfast seems simple, but it contains rich scientific truth. It is very wrong to skip dinner or grab something to eat. Reasonable and healthy breakfast collocation is the premise of our healthy body. Let's focus on breakfast together.

In the spring of March, I took a taxi, greeted the warm spring breeze, accompanied by flowers all the way, hung all the way, and shaded all the way, and once again came to the ancient town on the border of Funing County to stand out.

Oh! The ancient town has changed and become so beautiful and spectacular. Here, the beauty of the bridge, the beauty of the water and the beauty of the countryside constitute a beautiful picture of the harmony between natural landscape and human landscape. That kind of romantic, chic, quiet and elegant charm makes people feel relaxed and happy, lingering.

Colorful bridges are a unique landscape here. Many years ago, it was a water town of Zeguo. At that time, interpersonal communication, in winter, had to take a wooden bridge and take a small ferry; In summer, boys often wade across the river naked in order to take shortcuts. In recent years, residents raised funds to build 1 15 bridges. These bridges are small and exquisite, with unique shapes, such as crescent bridge, hyperbolic arch bridge, high beam bridge and flat bridge with boats under the bridge; There are cement bridges, red brick bridges and stone bridges. These small bridges, under the refraction of sunlight, set off clear water, blue sky, white clouds and green shade, which are particularly enchanting. What makes people even more proud is that the 257-meter-long and 8-meter-wide Heli Bridge is like a waterspout, spanning Sheyang River. Looking from a distance, it is magnificent, adding color to the blue sky, adding color to the earth and inserting wings for economic take-off. "A bridge flies north and south, and the natural moat becomes a thoroughfare", which has changed the past history that it is difficult to walk, cross the river and transport things.

Beautiful homeland is a beautiful scenery here. Don't you see that the high-rise buildings in the residential center have risen from the ground, with rows of tile houses on the ground, and the villa-style' foreign buildings' are elegant and impressive. Particularly striking is the majestic Panlong Ancient Temple, which stands on the Sheyang River. It is a building showing national style, which enriches the traditional cultural heritage of the ancient town and adds elegant tourist attractions for tourists. Look at the towns east of Ma Pingchuan. Surrounded by residential areas are endless pear orchards, peach orchards and ginkgo orchards. Whenever I am in Tomb-Sweeping Day, it is really "like spring breeze, night comes, blowing open the petals of ten thousand pear trees". Pear blossom, peach blossom and ginkgo blossom are in full bloom, which looks like a gorgeous world from a distance. Under the clear eyes of Wan Li, there are sometimes moving scenes of white clouds, pears, butterflies and bees dancing together, but the residents just. This magical land is full of flowers, red and green, and even rabbits, pheasants, wild pigeons and wild birds come here to nest, thrive, live in harmony with people and enjoy a beautiful life. The beautiful and fragrant ecology glows the local people's interest in guarding their hometown. It is often said that "the morning is prosperous and the lotus flowers are brought home." On this day, many tourists can't help sighing at the natural scenery of blue and green water, burning flowers and smoke.

Stand out is moving towards rural urbanization, and people are looking forward to the dream of "shining in the lotus country" coming true.

A few days ago, my mother took me shopping in the supermarket. We bought drinks, snacks and a bag of eggs. On the way home, my mother asked me to get the eggs. Because the egg is too heavy, I raise it with one hand and hold it from below with the other.

When I got home, my mother asked me if my egg was broken. I looked at the egg and said, "There are many broken eggs in the middle."

I didn't wrestle on the road, so how did my egg break? So I asked my mom. My mother asked me, "What shape is an egg?" "It's oval." I replied. I asked my mother, "What does this have to do with broken eggs?" Mother asked me to put two eggs together. I tried for a long time, but I couldn't get them together. I can only get the eggshells of two eggs together at most. I asked my mother what this meant. My mother pointed to the contact point of two eggs and said, "The key to breaking eggs is this contact point." My mother saw me and said, "there are many contact points between eggs, but the contact area between eggs is very small." Although the contact area is small, it bears a lot of force, so the egg is broken. " Then my mother asked me to put an egg on the table and let me stick it with a pen tip. It didn't take much effort to get stuck.

There are also many scientific truths in our life, waiting for us to explore and learn!