31 CZEN 2008 CZEN is developing an ontology for data for the Critical zone and we have suggested this structure that shows much of the data that is being collected for the Critical Zone at many sites around the world. We seek suggestions on this ontology as to what is missing or what does not make sense. An ontology can be used to structure cyberinfrastructure for data storage online. Please post comments here by clicking "Add new comment" below (you must login to add a comment).