How are these things made? Are they man made or some UFO type thing is making them? Or is it some undiscovered form of energy in the earth? Or is there some other explanation.
In my person opinion all crop circles are not man made cuz nobody has ever been spotted making a crop circle in daylight and one night is not enough to make such huge and complex crop circles. I think it is a form of energy inside earth's crust that is not yet discovered is making these circles.
Most critical observers, and the scientific mainstream, are convinced that crop circles are sniggles or hoaxes engineered by humans. This explanation, supported by the documentation produced by some crop-circle hoaxers, has the advantage of not requiring us first to assume the existence of flying saucers or other as-yet-unobserved phenomena. However, there are many contending hypotheses which assume that at least some crop circles are not the products of mundane hoaxers; these hypotheses vary in their degree of scientific rigor, but all fall to some extent outside the mainstream.
One modern unscientific belief, is that crop circles are created by flying saucers landing in fields and flattening a neat circle in the crop. However, the increasing complexity of formations from the 1980s on, and the implausibility of the idea that extraterrestrial beings would travel to Earth for the sole apparent reason of flattening crops, make this conjecture seem unlikely.
Some pseudo scientifically inclined enthusiasts suggest that an explanation more plausible than flying saucers might be cymatics, the visualization of vibration or sound. According to this hypothesis, the complex patterns are two-dimensional geometric or visual representations of sound frequencies, with higher sound frequencies producing more complex shapes similar to both mandalas and crop circle designs.
Another pseudoscientific hypothesis is that a man-made satellite in Earth orbit is using some kind of beam (e.g., microwaves) to create the designs. Heating stems of wheat with a short intense burst of microwave energy can produce wilting similar to that in a crop circle. Flattened stems often have the bend just below a stem-node, and also may feature blackened burn holes indicative of intense heating. Microwave heating has been shown to be capable of producing these effects. It is postulated by believers of this theory that the U.S. Pentagon's "Star Wars" programme has a satellite capable of delivering such a microwave beam.
Often touted as evidence for the mystic origin of crop circles is the coincidence that many circles in the Avebury area of southern England occur near ancient sites such as earth barrows or mounds, white horses carved in the chalk hills, and stone circles. Other ideas on their formation have been proposed include tornadoes, freak wind patterns, ball lightning, and something called "plasma vortices".
A number of witnesses claim to have observed circles being created, saying that it takes a few seconds and the corn falls flat like a fan being opened – though these accounts are always anecdotal and have never been supported by any evidence beyond the claimants' assertions. Crop circle enthusiasts, though they do not always have scientific backgrounds or credentials, claim that there are other features of crop circles that undercut the hoax theory. They say that bends in the corn in many circles occur just below a joint, while the flattening of the corn by hoaxers produces a crack at any point in the stem, and some scientific studies on apical nodes bear them out. Also they say that flattened corn often lies in groomed layers, rather than random crushing. While there have been cases in which believers declared crop circles to be 'the real thing', only to be confronted soon after with the people who created the circle and documented the fraud, the bending issue remains in dispute. For this reason, skeptics prefer the explanation that there are simply different hoaxers employing different techniques.
In 1991, more than a decade after the phenomena began, two men announced that many crop circles were a hoax of their doing. Doug Bower and Dave Chorley revealed that they had been making crop circles since 1978 using planks, rope, hats and wire as their only tools. Bower and Chorley stated to reporters that a small group of people can stomp down a sizeable area of crop in a single night.