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Geomorphology Home Page, University of Virginia (Popularity: ): Information and research on fluvial geomorphology and landform evolution on Mars.
Whisprwave (Popularity: ): Beach erosion control devices.
TEMPEST Wave Defense System (Popularity: ): Firm designing and manufacturing custom breakwaters that prevent beach erosion and coastal damage.
Terra-T (Popularity: ): Terra-T is a ground surfacing and erosion control device designed to provide a stable load bearing surface.
Meteor Crater (Popularity: ): Official site for the visitors center at the Barringer meteor crater. Short history, animations, visitor information.
Lonar Crater (Popularity: ): A 2km diameter impact crater in India. Background information, tourism, scientific literature, student guide.
Impact Structures (Popularity: ): Geology, geophysics, and petrology of impact structures (meteorite impact craters) with special focus on the Azuara and Rubielos de la Cérida impact structures (Spain)
National Speleological Society (Popularity: ): Advancing the study, conservation, exploration, and knowledge of caves. Although primary focus is on recreation, site has extensive information and links about caves and karst.
Karst Dynamics Laboratory (Popularity: ): Institute based in Guilin, China undertaking research that includes the development of karst water resources, the carbon cycle in karst and geological hazards.
Karst Pages (Popularity: ): Site aiming to facilitate publishing and debating of data based research papers. Table of contents organised by subject, galleries, exploration history and blind cavers program.
USGS Coastal and Marine Geology Program (Popularity: ): Describes ongoing projects and research plans for assessing coastal, estuary, and continental shelf processes, sediment transfer, and related geologic hazards.
National Soil Erosion Research Laboratory (Popularity: ): Homepage of the National Soil Erosion Research Laboratory of the Agricultural Research Service of the U.S. Department of Agriculture at Purdue University, West Lafayette, Indiana, USA.