Geognosy is a subject area dealing with the geological features and structure of the earth's crust. It is an essential field of study for geologists and geophysicists, who need to understand the nature and behavior of the earth's materials. Synonyms of geognosy include geology, petrology, mineralogy, stratigraphy, and geomorphology. Geology covers many areas of the earth, including its structure, composition, and processes, while petrology looks at the composition and structure of rocks. Mineralogy, on the other hand, deals with the study of minerals and their properties. Stratigraphy examines the succession of rock layers, and geomorphology looks at the processes that shape the earth's surface. Synonyms for geognosy indicate the diversity of knowledge required in this field.