GEYSERS AND HOT SPRINGS 117 dissolution of reeds, and these have to be filled artificially, after which the stone makes a striking cladding, showing sinuous algal banding (Figure 14) See Also Biosediments and Biofilms Earth: Mantle; Crust Minerals: Carbonates Tectonics: Hydrothermal Vents At Mid-Ocean Ridges Volcanoes Further Reading Figure 14 Travertine cladding on a McDonald’s Restaurant, Hereford, England Photograph by GJH McCall GLACIERS See SEDIMENTARY PROCESSES: Glaciers Albu M, Banks D, and Nash H (1997) Mineral and Thermal Groundwater Resources London: Chapman and Hall Arnorsson S (2000) Geothermal energy In: Hancock PL and Skinner PJ (eds.) Oxford Companion to the Earth, pp 437 440 New York: Oxford University Press Cargo N and Mallory BF (1977) Man and His Geologic Environment Reading, MA: Addison Wesley Green J and Short NM (1971) Volcanic Landforms and Surface Features: A Photographic Atlas and Glossary New York, Heidelberg, Berlin: Springer Verlag Kellaway GA (1991) Hot Springs of Bath: Investigation of Thermal Waters of the Avon Valley Bath: Bath City Council Mazzoni A (1954) The Steam Vents of Tuscany and the Larderello Plant Bologna: Arti Grafiche Calderini McCall GJH (1967) Geology of the Nakuru Lake Hannington Thomsons Falls Area Geological Survey of Kenya, Report No 78 Nairobi: Ministry of the Inter ior, Geological Survey of Kenya McCall GJH, de Mulder EFJ, and Marker BR (1996) Urban Geoscience Rotterdam and Brookfield, VT: Balkema Scarth A (1997) Savage Earth London: Harper Collins