Craters of extinct and passive volcanoes are circular depressions in the ground caused by ancient volcanic activities. It is typically a basin, circular in form within which occurs a vent (or vents). Because of their inaction these craters mostly suffered many changes caused by atmospheric and human factors. Unusual and beautiful volcanic cones, traces of human activity, lush vegetation and colourful crater lakes are the main reasons why many tourists visit these extraordinary destinations.
Top image: Kelimutu, Indonesia.
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