Crop circles are usually found in East American countryside and fields. Many people have talked about them and said that they are alien and un-human. Many crop circle patters have been found and they have not been made by human beings.
America is also a place where many so called UFOs are sighted regularly and on several occasions after a UFO sighting, a crop circle is soon found in the area. The reason for this is unknown. The UFOs might just be strange looking balloons or toys that fly in the air that could be filled with helium gas. When these things are sighted, people can be very suspicious about these things and many people think to begin with that they are UFOs.
Since there is no solid proof that aliens exist, we have to believe that humans made the crop circles and deny any possible unknown extra terrestrial activity. The reasons why there is a very, very unlikely possibility of alien existence is because earth is the only planet that can support the lives of living creatures. This is firstly because of the distance from the sun, secondly, the fact that there is water on the planet, and thirdly, because there is enough oxygen and carbon dioxide around for creatures to breathe.
The main connection with crop circles and UFO sightings is the strange aftermath of events that occur after a UFO has been seen. Lots of alien and UFO films have been set in Eastern America because this is where these UFOs have been spotted to have been seen the most.
For the time being, we humans are unsure that aliens or any other type extra terrestrial exists and we only know a tiny bit about our planet, the other planets in our solar system and the universe itself. There is so much to explore and so much to discover that it could take years and years for the human race to find out the truth about extra terrestrial and alien life. Hopefully with more technology available and more scientific results we will get that little step further in to our knowledge of the universe.