determines material entity material entity environmental feature A material entity determines an environmental system when its removal would cause the collapse of that system. For example, a seamount determines a seamount environment, acting as its 'hub'. This class is currently being aligned to the Basic Formal Ontology. Following this alignment, its definition and the definitions of its subclasses will be revised. A material entity which determines an environmental system. ENVO ENVO:00002297 environmental system