Alphabetical listing of categories: U

a b c d e f g h i j k l m n o p q r s t U v w x y z

Number of information resources is shown in parentheses after each term.

U -> uranium (4) unconformities (2) unconsolidated deposits (48) underwater contours -> bathymetry (37) underwater photography (1) bedrock geologic units (214) geologic units -> stratigraphic sections (249) surficial geologic units (128) uplands -> physiographic features (35) uplift (1) upwellings -> hydrographic features (12) uranium (4) urbanization -> land use change (2) land use and land cover (1) land use change (2) land use maps -> maps and atlases (279)