"Volcanic eruption", you must have seen it on TV, but have you seen it with your own eyes? I have seen a "volcanic eruption", but this is a simulation experiment of "volcanic eruption", and I have done this experiment myself. Wow, "Volcanic eruption" is really fun. I brought a glass, a bottle of vinegar and a bottle of detergent, a pack of baking soda and a newspaper according to the experimental requirements. Pour some baking soda into the glass first, then some detergent, and then put the newspaper under the glass. The experiment is about to begin. I poured some vinegar into the cup, and a miracle soon appeared. There was only some baking soda and detergent in the bottle just now. They are quiet. How did it turn into a bubble in a few seconds? Moreover, it was just a little bubble, but now it has been soaring. Only after more than ten seconds, it poured out from the glass mouth, overflowed the bottle mouth and flowed into the newspaper. At this time, I was excited and surprised, staring at the floating foam, for fear of missing any details. After about 18 minutes, the bubbles gradually disappeared. Ha, this experiment is so fun, so interesting! Why is this? I quickly grabbed the book and read it. I didn't mention a word in it. Alas! I have no choice but to find a way by myself. Didn't Mr. Liu say in class that baking soda and vinegar will react chemically and produce many bubbles, just like soda water, shaking it will also produce some bubbles. So what role does detergent play? I've racked my brains but I can't figure it out. In order to find out the mystery, I repeated the experiment and found that the reason why the bubble soared was because the detergent played a catalytic role. This is similar to the formation principle of pumice. This little experiment is really interesting. Doing small scientific experiments made me understand the scientific truth while playing, and also exercised my ability to use my hands and brains. It is really the best of both worlds.

"I'm so happy today. I finished my homework in half an hour. Great!

"I said to myself. What to do with the rest of the time?

I should go and see the little goldfish my mother bought. I walked quickly to the front of the flat fish tank, and the fish seemed to welcome me and swim to me. Among them, the lion-headed goldfish has a big head and a red and white tail, which seems to show off its beauty. It suddenly occurred to me: Why should fish control their balance in water?

I observed that the fish kept swinging while swimming. Can fins and tails work? In order to verify my guess, I made a bold experiment. I prepared small scissors, fishing nets and gauze first. Then I fished out a grass carp to feed the tortoise with a fishing net. The fish seems to be aware of the danger-struggling desperately. I silently said to the little fish, "Don't be afraid, little fish, just give it once for the success of the experiment!" "

"I stuck the double-sided tape on my thumb and forefinger and stuck the small fish. I picked up the scissors carefully and cut off the fins of the small fish. After cutting, I gently put the bald fish into the fish tank. At first, the little fish struggled for a while and then sank to the bottom of the water. After a long time, it didn't swim again. It seems that my guess is correct.

I was still a little worried, so I looked it up in the encyclopedia. It really said: Fins make fish balance. The fish's tail controls the direction. Through this experiment, I feel how interesting it is to acquire knowledge through observation and experiment.