Science keywords categorized by: category topic term and variable More information: http://gcmd.nasa.gov/Resources/valids/keyword_list.htmlhttp://gcmd.nasa.gov/Resources/valids/keyword_list.html
Olsen, L.M., G. Major, S. Leicester, K. Shein, J. Scialdone, H. Weir, S. Ritz, C. Solomon, M. Holland, R. Bilodeau, T. Northcutt, R. Vogel. 2004. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 5.1.1
Weeds, Noxious Plants Or Invasive Plants
Glacier Mass Balance/Ice Sheet Mass Balance
Atmospheric Chemistry/Hydrogen Compounds
Atmospheric Chemistry/Halons and Halogens
Atmospheric Chemistry/Nitrogen Compounds
Atmospheric Chemistry/Carbon and Hydrocarbon Compounds