Underwater World Fourth Grade Composition

Many people have had the experience of writing essays in their study, work, and life, so they are all familiar with essays. With the help of essays, people can achieve the purpose of cultural exchange. I believe many people will find it difficult to write essays. Below are 7 fourth-grade essays on the underwater world that I have collected for you. They are for reference only. You are welcome to read them. Fourth grade composition on the underwater world Part 1

There are all kinds of wonders in the world, and the underwater world is even more bizarre. If you don’t believe me, just listen to me.

1. Sea anemone and clownfish

There are many animals in the wonderful seabed that can benefit each other, such as clownfish and sea anemone. Clownfish are mostly red and white and look like a clown. Sea anemones are not plants, but animals. Each "petal" is covered with poisonous cells, which are lethal weapons!

And it is cruel and will not harm the clownfish. The clownfish has a "protective film" on its body, and its smell causes the sea anemone to mistake it for its own species. In this way, the clownfish helps the sea anemone attract other fish to take the bait, and the sea anemone protects the clownfish, helping each other, which is beneficial to everyone.

2. Magical dolphins

There are also some magical animals that can sleep while swimming. These are dolphins. The dolphin's brain is special. When the left half of the brain is awake, the right half of the brain enters a resting state. When the right half of the brain is awake, the left half rests. By switching back and forth like this, you can rest without delaying your swimming. It really kills two birds with one stone!

3. The strange flounder

The eyes of the flounder are very strange. The eyes of other fish are on both sides of the head, but its eyes are all on the same side. In fact, it was not like this when it was young. It was no different from other fish when it was young. As it grows older, one of its eyes slowly moves to the other side, and eventually grows to the same side. Even though it is small, it can scare even sharks to death. Because it can secrete a toxic substance that, although harmless to the human body, can paralyze sharks. People use this substance to make "shark-proof spirit", which has a wide range of uses.

4. The Overlord of the Ocean - Shark

The most familiar marine creature to us is the shark. Sharks are the dominant species in the ocean and feed on almost all fish (except flounder). The most ferocious thing in the ocean is the great white shark, which is the largest carnivorous shark; but not all sharks eat meat and are so ferocious. Like the "basking shark", although its size is second only to the whale shark, it swims It is slow, docile and will not kill at will.

5. Beautiful killer - jellyfish

If sharks are brutal killers, then jellyfish are beautiful killers. Each translucent jellyfish is like a small parachute. The tentacles below are like fluttering ribbons. Don't be fooled by its beautiful appearance, it is a powerful killer! Each of its tentacles is covered with poisonous cells, which first paralyze the opponent and then kill the opponent with venom. Then put it into your mouth little by little. If you see a jellyfish, don’t mess with it!

6. Angler fish in the deep sea

In the depths of the sea, a glimmer of light appears. Oh, this is an anglerfish. She is female. Most of the anglerfish we see are female. So how do they reproduce? Look carefully at her body, there are many small bumps. That is her "little husband". The nutrition of the food she eats must also be given to her "little husband". These "little husbands" will slowly die after the breeding season. The anglerfish has a small meat ball on its head. When it hides to hunt, it will expose the small meat ball and swing it to attract small fish to "take the bait".

7. The seahorse father who can "give birth"

One little seahorse hooks another little seahorse's mouth and is born! hehe! The person who "gave birth" to the baby seahorse was actually the seahorse father! How strange. How do male seahorses give birth to children? In fact, it is the seahorse mother who "gives birth" to the baby seahorse. She lays the eggs into the seahorse father's pouch and lets the seahorse father hatch them.

The birth posture of baby seahorses is very interesting. When a baby seahorse is born, it will hook the mouth of the second baby seahorse with its tail, and the second baby seahorse will hook the mouth of the third baby seahorse with its tail... until the last one. A baby seahorse is born!

The wonders of the underwater world cannot be described in a short while. Everyone must enrich their knowledge and learn more about the things under the sea! Fourth grade composition on the underwater world Part 2

Do you know what the depths of the sea look like?

The seabed is a world with strange scenery and rich products. It has peaks and valleys, like our mountains and rivers. It is rich in coal, iron, oil and natural gas. There are also rare non-ferrous metals on land.

When the waves roll on the sea, the bottom of the sea remains calm. The animals on the sea floor are whispering, but we can’t hear them. If you use a special hydrophone, you can hear various voices. They make one sound when eating, another sound when traveling, and can also sound an alarm when encountering danger.

The characteristics of the activities of undersea animals are also different. Sea cucumbers, grilled chicken, telescopic crawlers, barracudas can swim several kilometers per hour, and when attacking other animals, they are faster than an ordinary train. The squid can spray water forward and use his reverse thrust to retreat. Some deep-water fish have light-emitting organs on their bodies and swim like twinkling stars.

There are also many plants on the seabed, with colorful colors and different shapes. There are more than 8,000 species in one species.

Look, the bottom of the sea is so rich. It is really a world with strange scenery and rich products. Fourth Grade Composition on the Underwater World Part 3

I found that due to my laziness, my journal was always late for a long time. We went to the aquarium on Thursday. It was really a fun place.

I was surprised that the fish in the water have so many colors, and each one is so pure. Watching them have a gorgeous appearance and swim in the water so contentedly, like a princess. of happiness. There are also cute starfish. Someone can touch them in the touch pool. It took me a long time to find them. They are actually similar to the rocks on the seabed, but they look like five-pointed stars. A sign next to it reads: Please don’t bite the starfish. Haha, these poor little guys.

What excites me the most is the dolphin show. These dolphins are really smart. They can sing, applaud, and dance. In the clear water, they flipped and jumped carelessly, competing with each other to express themselves. The life of a dolphin is so happy.

Actually, I no longer feel like I did when I wrote these things now, but I know it was a happy time. Please go and read it when you have time. Fourth Grade Composition on the Underwater World Part 4

In the far north of the Pacific Ocean, there is a quiet and harmonious beach, where all creatures on the seabed live in peace. One day, the previous tranquility of the underwater world was broken by a quarrel...

I saw Mr. Crab at the Krusty Crab restaurant holding a lot of money and said proudly: "Haha! I am Monopoly, I'm better than you! My hands are like big pliers, and only the lobster boy can be my friend."

Brother Squidward, the cashier of the Krusty Crab King, heard this. Not satisfied anymore. He said unconvinced: "Tch! What's the big deal about having more money? You're just a miser! If we compete, I have eight, how about it?"

SpongeBob, the chef of Mr. Krabs, it He never argued about anything and always had a smile on his face, but this time, he shouted angrily: "You are not as powerful as me. I can stretch and shrink freely. No matter how anyone treats me, I can be calm and composed!"

Patrick, who was eating a burger at the Krusty Crab King, spoke up. He said, "Stop arguing! Can you compare to me? My five hands can still grow after they are broken. What about you?" ? There’s no need to argue, it seems like I’m the strongest.

"

Another customer of the Krusty Crab, Senior Eel, said nonchalantly: "Young people are young people, and no one can match my skills! If you make me angry, I will electrocute him into dust! "

"My Mr. Krabs has strong hands, I am the strongest! "My Brother Squidward can do many things at the same time. I'm stronger!" "You can squeeze me as much as you want, and I, Spongebob, won't even blink!" "Even if you chop off my Patrick Star's hands, it doesn't matter to me, because they will still grow!" "You actually don't recognize me, Senior Eel, be careful I'll shock you!" ”

……

Just when they were having a heated argument, Brother Shark walked into the Krusty Crab restaurant with Miss Whale on his arm. After they knew the reason for the quarrel, they sighed. In one breath, he said: "You all have your own advantages, just like: Mr. Krabs and Mr. Eel can protect the country and be admirable heroes; Spongebob and Patrick can be acrobats, making people smile. ; Brother Squidward has so many hands, he can definitely be a dancer and a national idol! In fact, we all have our own advantages, but why should we argue here instead of giving full play to our respective advantages? ”

Everyone suddenly realized it! Undersea World Fourth Grade Composition 5

During the summer vacation, my mother took me to Hangzhou Underwater World. As soon as I entered the door, I saw many beautiful fish. We were swimming freely in the aquarium. When we were walking in the underwater tunnel, I saw a very big shark swimming above my head. My heart trembled a little, as if the big shark would eat us.

After walking through the undersea tunnel, we came to the dolphinarium and watched the wonderful performance of the dolphins. The uncle first asked the two little dolphins to jump in the circle, and they jumped over flexibly. Then he asked the little dolphins to kiss the audience's hand. On the railing, the dolphin jumped and kissed me, and I felt funny and happy.

Then, we also saw the stupid clown fish, the red butterfly fish, the crystal clear transparent fish, and the dolphin fish. The lively and lovely tropical fish are so diverse and exciting! The most eye-catching ones are corals, some are like branches, and some are like willow vines, with different shapes, big and small, strange and colorful.

Seeing these colorful aquatic animals, I know that there are countless mysteries in the world. Fourth grade composition of the underwater world 6

Once upon a time there was a sea with crystal clear bottom. , excellent drainage. No pollution at all.

A squid swam by, and it hid in the seaweed. It turned out to be a huge shark rushing toward him with its mouth wide open. In a nervous situation, he ran into the seaweed. When the shark saw him running into the seaweed, he returned the same way. However, when it relaxed, a huge pliers clamped it to death. After a few minutes, a drop of ink appeared. It floated out from the seaweed.

At night, herbivorous creatures held a meeting, and carnivorous creatures were not allowed to enter. How to verify who is carnivorous or herbivorous? The turtle came up with a good way, and the octopus took ten. A basket of seaweed. Every fish has to eat a bunch of grass and swallow it if it wants to come in. If a fish wants an octopus, it will be locked up in a herbivorous prison for a hundred years and eat grass every day.

The world under the sea is so beautiful, and there are many stories. Fourth grade composition on the underwater world 7

One day during the summer vacation, my father and mother walked into the Shengya Underwater World in Dalian and couldn't help but be fascinated by what we saw. The scene attracted me.

“Ah, it’s so beautiful here! "I walked along the passage, and through the glass window, I saw groups of fish beside me, greeting me; colorful corals in various poses.

The fish here are really diverse. ! Such as: Ringed Lionfish, which has many brown-red horizontal stripes on its body, and its fins are particularly large. The body of the Ringed Double Sawfish is pink, with a white vertical band between the corners of the eyes and a white stripe behind the eyes. , so interesting! There are also seahorses, flame clams, sawfishes, horsefish, and five-banded damselflies. The most interesting one is the black-spotted eel. Do you know how big it is? The largest individual is 1.

It’s 8 meters!

"Ah, no, the shark is coming!" I saw the shark swimming over my head with murderous intent. I found a few small fish clinging to the shark's back, looking at my surprise with joy. The expression said, "Mom, they are so brave!" "No, those small fish are stuck there, and the sharks can't eat them even if they want to." That's it!

The passage of more than 300 meters was about to end. It was supposed to have a happy ending, but at this moment, I was horrified to see two turtles biting the heads of small fishes, ah! It was all covered in blood. I didn’t expect that the turtle, which looked like a gentleman, would actually eat small fish. How cruel!

Time slipped away unconsciously, and the passage came to an end. My feet took me out of the underwater world, but my heart is still wandering in this ever-changing and colorful underwater world...