3-5030..........Physical geography

Physical geography

Physical geography is one of the two major subfields of geography. Physical geography is that branch of natural science which deals with the study of processes and patterns in the natural environment like the atmosphere, biosphere and geosphere, as opposed to the cultural or built environment, the...

400-649..........Geomorphology

Geomorphology

Geomorphology is the scientific study of landforms and the processes that shape them...

. Landforms. Terrain

Terrain

Terrain, or land relief, is the vertical and horizontal dimension of land surface. When relief is described underwater, the term bathymetry is used...

447..........Climatic geomorphology

448..........Slopes

450-460..........Coasts

461-468.995..........Reefs

471-478.995..........Islands

500-555..........Mountains. Orography

Orography

Orography is the study of the formation and relief of mountains, and can more broadly include hills, and any part of a region's elevated terrain...

561-649..........Other natural landforms: Floodplains, caves, deserts, dunes, etc.

651-2998..........Hydrology

Hydrology

Hydrology is the study of the movement, distribution, and quality of water on Earth and other planets, including the hydrologic cycle, water resources and environmental watershed sustainability...

. Water

980-2998..........Ground and surface waters

980-992.......... Watersheds

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

. Runoff. Drainage

1001-1199.8..........Groundwater

Groundwater

Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of rock formations. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock...

. Hydrogeology

Hydrogeology

Hydrogeology is the area of geology that deals with the distribution and movement of groundwater in the soil and rocks of the Earth's crust, . The term geohydrology is often used interchangeably...

1201-1598..........Rivers. Stream measurements

1601-2398..........Lakes. Limnology

Limnology

Limnology , also called freshwater science, is the study of inland waters. It is often regarded as a division of ecology or environmental science. It covers the biological, chemical, physical, geological, and other attributes of all inland waters...

. Ponds. Lagoons

2401-2598..........Ice. Glaciers. Ice sheets. Sea ice

2601-2798..........Snow. Snow surveys

2801-2998..........Hydrometeorology

Hydrometeorology

Hydrometeorology is a branch of meteorology and hydrology that studies the transfer of water and energy between the land surface and the lower atmosphere....

5000-5030..........Natural disasters

Sources