Oceanography is sub-categorized into more specialized cross-disciplines, such as physical oceanography and marine biology. Science cruises cover physical oceanography, marine geology, and marine biology. Geophysical fluid dynamics is a primary tool in physical oceanography and meteorology. Climatology now includes aspects of oceanography and biogeochemistry. Marine Chemistry, Physical oceanography and Atmospheric sciences are closely related to this field. It has been used in many fields of research, including astrophysics, ballistics, volcanology, and oceanography. Oceanography, or marine biology, is the branch of Earth science that studies the ocean. Exhibitions educate the public on natural history, dinosaurs, zoology, oceanography, anthropology, and more. Maritime history also deals with the development of navigation, oceanography, cartography and hydrography. The expedition was centred on Antarctic and Sub-Antarctic oceanography, climate and biology. Colwell holds degrees in bacteriology, genetics, and oceanography and studies infectious diseases. Vocational Education is divided to Agricultural Science, Industry, Commerce, Oceanography, and Home Economics. Bush showed support for oceanography and space exploration; and supported sciences on reducing pollution. There are also offices of the National Institute of Oceanography and the India Meteorological Department. The term undertow is used in scientific coastal oceanography papers.