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aerial photograph alluvial fan Antarctic Circle barrier island biomes boundary cartographer climate graph continent continental divide contour map coulee deforestation demography desertification ecosystem elevation floodplain flow map gorge grasslands hemisphere international date line isthmus landform landlocked country Landsat image latitude longitude Mercator projection meridian monsoon moraine natural hazard North Pole ocean currents Pacific Rim parallel physical map plains plate tectonics plateau political map pollution population density prevailing winds prime meridian rain shadow region relative location Robinson projection satellite image settlement pattern silting South Pole terrace thematic map time zone topographic map Tropic of Cancer Tropic of Capricorn watershed weathering