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Electromechanical Disintegration
Electromechanical disintegration is a process in geomorphology in which lightning interacts in erosion and weathering. Karfunkel, 2001 (see: References). An excellent example of this phenomenon is fracturing in the quartz formations of the Espinaςo mountains of Brazil. For many years, itinerant miners in these mountains have reported the appearance of broken boulders and fissures along the ground after lightning storms. The Espinaςo Range represents a typical site for orographic thunderstorms, which develop from the ascent of air along mountain ranges. These storms have the highest rate of lightning occurrence and are therefore useful for studying the effects of such atmospheric discharges. These discharges have peculiar features: velocities of and plasma temperatures of are achieved in nanoseconds in lightning channels. Evidences of the effect of lightning on rock are the presence of beta-quartz (T > , called "flashstones" by local diggers), melted barbed wires (T > ); fur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geomorphology
Geomorphology (from Ancient Greek: , ', "earth"; , ', "form"; and , ', "study") is the scientific study of the origin and evolution of topographic and bathymetric features created by physical, chemical or biological processes operating at or near Earth's surface. Geomorphologists seek to understand why landscapes look the way they do, to understand landform and terrain history and dynamics and to predict changes through a combination of field observations, physical experiments and numerical modeling. Geomorphologists work within disciplines such as physical geography, geology, geodesy, engineering geology, archaeology, climatology, and geotechnical engineering. This broad base of interests contributes to many research styles and interests within the field. Overview Earth's surface is modified by a combination of surface processes that shape landscapes, and geologic processes that cause tectonic uplift and subsidence, and shape the coastal geography. Surface processes co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
