| .C1 |
General |
| .C18 |
Relief models. Raised
relief globes |
| .C2 |
Physiography. Geomorphology |
| |
| |
Including relief features and
bathymetry |
|
| .C21 |
Natural geographic regions.
Geophysical divisions |
| .C23 |
Caves. Underground grottoes |
| .C28 |
Ground characteristics. Surface
quality. Terrain studies. Slope |
| .C3 |
Hydrology. Hydrogeology |
| |
|
| .C31 |
Hydrographic surveys. Status. Progress |
| .C315 |
Drainage basins. Catchment areas |
| .C32 |
Floods |
| |
|
| .C34 |
Ground water. Water table |
| .C35 |
Water composition and quality |
| .C36 |
Mineral waters |
| |
|
| .C38 |
Glaciers. Glaciology |
| |
|
| .C5 |
Geology |
| |
| |
Cf. N24,
Engineering geology |
|
| .C51 |
Geological surveys. Status. Progress |
| .C55 |
Dynamic and structural geology.
Tectonics. Earthquakes (Seismology). Vulcanology |
| .C57 |
Stratigraphy and paleontology.
Historical geology |
| .C7 |
Oceanography |
| |
| |
For characteristics and
morphology of the ocean bottom, see C2; distribution of aquatic life, see D1; economic aspects of aquatic life, see L |
|
| .C72 |
Temperature of ocean water |
| .C73 |
Salinity and density of ocean water |
| .C74 |
Icebergs |
| .C75 |
Ocean currents |
| .C76 |
Ocean tides |
| .C8 |
Meteorology and
climatology. Climate classification systems |
| .C813 |
Climate regions |
| |
|
| .C815 |
Weather forecasting |
| .C82 |
Atmospheric temperature |
| .C83 |
Insolation and radiation |
| .C84 |
Structure and mechanics
of atmosphere. Atmospheric circulation. wind systems |
| |
|
| .C842 |
Atmospheric pressure.
Surface winds |
| .C86 |
Storms |
| .C87 |
Atmospheric electricity |
| .C88 |
Atmospheric moisture and
precipitation |
| .C882 |
Condensation and
evaporation. Dew. Fog. Frost. Cloud cover |
| .C883 |
Rain |
| .C884 |
Snow. Snowmelt |
| .C885 |
Hail |
| .C886 |
Droughts |
| .C887 |
Artificial
precipitation. Rainmaking |
| .C9 |
Geophysics |
| .C92 |
Radioactivity |
| |
|
| .C93 |
Terrestrial magnetism |
| .C95 |
Gravity |