Physical and Chemical Weathering in Geochemical Cycles

acid activity Amazon amount areas atmosphere average basin budget calcite carbon cations changes chemical chemistry clay climate complexes composition concentration considered contain cycles deposits developed discharge dissolution dissolved distribution effects elements environments equation erosion estimated estuaries et al example factors Figure flow flux formation formed Geol Geological given global important increase indicate influence input involved iron Kempe Lake land layer less load loess lower major mass material Meade measurements Meybeck minerals mixing natural observed occur ocean organic organic matter origin oxidation paleosol particles periods Pleistocene present probably processes production range ratio reaction recent reduction regions relatively removal represents reservoir river rocks salinity sediment sedimentary shelf shown silt slope soils solid solution sources specific stages strontium studies supply surface suspended matter Table tectonic tion transport types units weathering zone