30-word composition weather forecast expert

On Sunday afternoon, when I came home from school, I suddenly found a spider weaving a web on my ceiling. I became curious about this spider and observed it carefully. I saw the spider stretched out eight furry legs and was hung in the air by a thin silk thread. The upper end of the silk thread is connected to the ceiling, and the lower end is connected to the small hole in the spider. As the spider's eight legs continue to weave the web, the web grows bigger and bigger. Looking at it, the sky was overcast and it rained cats and dogs in an instant. I looked at the sky, and then at the spider weaving a web. I was very curious. A question popped up in my mind: did it rain as soon as the spider spun the web? A big question mark appeared before my eyes.

So, with this question worth thinking about, I made a special observation on spiders.

I stared at this spider for a long time. I come here almost every day after school. Through observation, spiders always start to weave their webs before it rains.

Looking at this scene, I can't help thinking: Why do spiders always weave their webs before it rains? So, I turned on the computer and prepared to ask the "computer teacher". I immediately searched on Baidu, and soon found the answer: the silk spit out by spiders is made up of some microorganisms, which can't be distributed and formed into silk in sunny days, and can be quickly condensed and formed into silk only in rainy days. It suddenly dawned on me that it rained as soon as the spider spun the web. I'm so happy!

It turns out that spiders are not only beneficial insects, but also a weather forecast expert!