The moon plays a very important role on our earth. If the moon disappears, the earth will be seriously affected. First of all, the earth has an influence on the earth's tides. If the moon disappears, it may weaken the tides on the earth, even three times. Moreover, some tides are influenced by the sun. Of course, this influence is still quite small, because it is too far away from my earth. But in general, the moon will have a strong influence on the oceans on earth.
But also the horizontal height of the oceans on the earth. The moon has gravity. It is precisely because of this gravity that there will be "bubbles" in the equatorial region of the earth. If the moon disappears, this bubble will disperse to the polar regions, and at the same time it will bring a tsunami and cause flood problems. Even if it is serious, it may flood Antarctica, parts of South America and a series of places.
The earth is spinning all the time, but we humans live on the earth without feeling it. The moon may slow down the rotation speed of our earth, although it may only be for a few seconds, and it may not be obvious. If the moon disappears, there is no way to slow down the rotation speed of our earth. A day lasts about six hours, and may be accompanied by some natural disasters, such as strong winds, sandstorms and so on. And it will have an impact on the development of life on earth. If it lasts for more than ten hours, it is hard to imagine what kind of development direction animals and plants will have.
And the most important thing is that the moon plays a stable role. It is because of the moon that the circumference of our earth has a slope of 23 degrees, and it is also because of the moon that it provides us with comfortable and good seasonal conditions. If the moon disappears and the earth has no tilt of its axis, maybe the sun will never appear again. At night, without the moon, our earth will fall into darkness.