groundwater flood lakes rivers surface hydrology geology hydrology nodules concretion stylolites ball and pillow structures mud cracks sole marks graded bedding ripple marks herringbone structure cross bedding bedding plane laminations froude number reynold number types of flow of sediments hjulstrom curve sediment transport mechanism weathering and erosion sedimentary rocks sedimentary structures abundance of elements chemical composition of planets meteorites chemical composition of earth chemical composition of sun solar system origin of elements origin of universe
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