TAILIEUCHUNG - Encyclopedia of Global Resources part 143

Encyclopedia of Global Resources part 143 provides a wide variety of perspectives on both traditional and more recent views of Earth's resources. It serves as a bridge connecting the domains of resource exploitation, environmentalism, geology, and biology, and it explains their interrelationships in terms that students and other nonspecialists can understand. The articles in this set are extremely diverse, with articles covering soil, fisheries, forests, aluminum, the Industrial Revolution, the . Department of the Interior, the hydrologic cycle, glass, and placer mineral deposits. . | 1326 Weathering Global Resources so is a common constituent of beach sand soil and many sedimentary rocks. Rocks such as basalt that contain abundant ferromagnesian minerals quickly begin to weather when exposed at the Earth s surface granite a quartz-rich rock resists weathering. Natural Resources and Weathering Weathering processes produce or affect most of the world s natural resources. Soil and soil fertility the character and quality of water supplies sediments and sedimentary rocks all are dependent on weathering. A combination of chemical and physical weathering produces soil our most important natural resource. Without soil terrestrial ecosystems could not develop or survive. Weathering provides the parent material for soil and alters soil texture and composition as it matures. The type and quantity of soil an important influence on vegetation result directly from the types and rates of weathering. In areas where erosion of soil exceeds its development by weathering processes fertility declines and so production of natural or agricultural vegetation declines as well. The future of humankind may well depend on our ability to control rates of soil erosion. Chemical and physical weathering contribute to the character of surface water by determining the amount and type of dissolved and suspended solids present. Chemical weathering produces dissolved solids from rocks and soils. These mineral solutions may enter surface water and groundwater supplies and benefit humans in appropriate concentrations at higher quantities however they can impair health. For example low dietary concentrations of selenium are vital to human health as indicated by the inclusion of selenium in multivitamin tablets . At higher concentrations it can be quite toxic even deadly. Weathering products such as soil also contribute to the cloudy appearance of river water after a storm a phenomenon known as sediment pollution. Making the water potable requires the removal of these suspended .

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