An essay about a vivid popular science speech 400 words

Yes! It's because I'm not good enough.

Now the earth is all yellow, and the green color has decreased a lot, what's wrong? It turned out that this was due to the massive felling of trees, which not only left the birds without a home, but also caused collapses, floods, etc. Without trees, our planet would be missing a pillar to support.

Now all the shops are following our hobby and mass-producing soda, and the "coat" of soda is the can, and the can is a kind of pollution, and the road, the park and even the school have become their home. Some cans are made of aluminum, which is also harmful to the human body.

Do you know? Used batteries contain a large number of heavy metal pollutants – chromium, lead, mercury, etc. The pollution caused by waste batteries is slow and far-reaching.

When they are mixed with ordinary household garbage, under certain conditions, a series of chemical reactions will slowly occur, releasing toxic substances, which will pollute the atmosphere when incinerated and pollute groundwater or rivers and lakes when seeping into the ground; Once it enters the soil and water sources, it will enter the human body through the food chain, damaging the nervous system, hematopoietic function, kidneys and bones. Therefore, it is classified as hazardous garbage. Tests have shown that

A single mercury battery pollutes more water than a person uses in a lifetime.

In the past, the river was so clear that small fish could be seen, but now in order to improve efficiency, the factory has used the river as a good place to discharge sewage, and the river is so dirty that pedestrians passing by are quickly leaving.

Saving water is protecting our environment, that is, saving resources. We should protect the environment with our own practical actions, the easiest way is to start from ourselves, pay attention to water conservation, such as: turn off the water tap at any time after using it; Use the water from washing vegetables to water flowers, mop shabu, and flush toilets.

Don't think that a few drops of water on the water faucet are nothing, a water faucet drops a drop of water every second, and 36 square meters of water are shed in vain in a year. If a household saves one side of water per month, how much water will the whole country save in a month?

Fortunately, now that people have realized that the earth is polluted, everyone has taken action, and I hope that those who have not taken action will bend down and pick up the paper on the ground, so that our tomorrow will be more beautiful and tidy!

I made a magical cane and I gave it to the blind because it was magical.

There are five buttons on this magic crutch, each button has a logo on it, press button one, this magic crutch will tell you if there is a peel or obstacle in front of you, if there is, it will make a beeping sound, and then the crutch will stretch out a pair of big hands to hold the obstacle.

Obstructions are placed in the bin in the crutch to protect the environment and keep the road clear. Press button two, this magic crutch will show you the way, go where you want to go, if you are tired of walking and want to go home, button three will come to help, this crutch will turn into a wheelchair for you to sit on"Wheelchairs"Rest it while taking you home. There are so many functions of the buttons!

If you press button four, the massager on the back of the chair will start massage, which can relax the muscles and invigorate the blood, specializing in cervical spondylosis, back pain and other symptoms, and is known as a 'family doctor'! This green button five is the hypnosis button, when sleeping, press this button, the sound inside the chair can send out a gentle **, urge you to fall asleep, and when you fall asleep, the chair will become a bed, ** will also automatically turn off.

Look at my crutches are amazing! Would you like to use your brains and create with me?

In fact, each of us has infinite strength, that is, our wisdom power, we must study diligently, and master the knowledge of science and culture.

I just ate it.

After eating a hot pot, just eat it