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Fluidization is a collective phenomenon of particulate beings behaving like a fluid. All particulate beings in nature such as soil, sand, gravel, snow, graupel, hail, volcanic ash, and living creatures show some fluidization phenomena temporally or continuously. However, so far no overview of fluidization in nature has been presented. In this article such an overview is attempted choosing topics from plateau formations both on the Earth and on the Moon, snow avalanches, landslides, pyroclastic flows, kimberlite magma ascents, and hailstorms. Accordingly, the fundamental issues of fluidization are reviewed prior to the review of fluidization phenomena in the nature so that the current achievements of fluidization science can be shared by people working in different disciplines. Due to their scarcity, to the largeness in scale, and to the extremeness in conditions as well as to the paucity of observed data, many discussions are still open to the future investigation.
Furthermore, the fundamental knowledge of fluidization so far developed is found effective but yet insufficient to deal with such a variety of natural phenomena. Angle of internal friction, rad. Mayumi Tsukada, Department of Chemical Engineering, Tokyo University of Agriculture and Technology kindly gave support for literature survey and Drs. Adina and Davide Peter Ross of Pangolin Associates Pty Ltd, provided their kind comments and advices. This article has not been cited. The purpose of this page is to provide resources in the rapidly growing area of computer-based statistical data analysis.