2019. June 27. Thursday
Domestication of horses changed the course of human history. Domesticated helped people populate inland and spreading of nomadic people. Horses provided transportation, changed ways of hunting, warfare and last but not least, agriculture. Just like other domesticated animals, horses provided meat and milk. They represented value in society. These roles existed side by side for centuries, though with ever changing significance.
Those minerals are liable to fluorescence which have some defects in their crystal-lattice and the places of defects are filled in by metal atoms. These metal atoms are ready to interact with ultraviolet radiation, their electrons going to higher energy level during to radiation and emitting the fluorescent light when falling back to the original level after the radition has been completed.