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Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally divided from Asia to its east by the water divide of the Ural Mountains, the Ural River, the Caspian Sea, the Caucasus Mountains (or the Kuma-Manych Depression), and the Black Sea to the southeast...

A crop circle is a sizable pattern created by the flattening of a crop such as wheat, barley, rye, or maize. The term crop circle entered the Oxford English Dictionary in 1990. In 1991, self-professed pranksters Doug Bower and Dave Chorley stated that they had started the phenomenon in 1978 by making actual circles on crops with the use of simple tools. However, crop patterns did not only persist but became astonishingly complex...

Sunset or sundown is the daily disappearance of the Sun below the horizon as a result of Earth's rotation. The time of sunset is defined in astronomy as the moment the trailing edge of the Sun's disk disappears below the horizon in the west. The ray path of light from the setting Sun is highly distorted near the horizon because of atmospheric refraction, making the apparent astronomical sunset occur when the Sun’s disk is already about one diameter below the horizon...