To derive is defined as to come from, be created from or be developed out of something else. An example of derive is when you get the idea for a new fund raising event based on the event the previous year.
Rubidium: geological information. Rubidium is far too reactive to be found as the free metal in nature. It is relatively rare, although it is the 16th most abundant element in the earth's crust. Rubidium is present in some minerals found in North America, South Africa, Russia, and Canada. It is found in some potassium minerals (lepidolites, biotites, feldspar, carnallite), sometimes with caesium as well.
The MuniÅ¾aba cave in Croatia is where some of the new centipedes were found. D. BakÅ¡iÄ/ZooKeys. The centipedes were found in the MuniÅ¾aba, Muda labudova and Lukina jama-Trojama caves in the Velebit mountains. The Lukina jama-Trojama cave system is the 15th deepest in the world. The area is known for is subterranean biodiversity; 54 species have been located in the cave system.