They typically represents different wavelengths of element due to its energy emission in the form of visible light. When an electron of that particular element move from a higher energy level down to a lower energy level, it gives off energy in the form of photon emission. Atom of a certain element has a unique electron arrangement thus it can considered that particular element's spectrum is unique.
The masses of the objects and how much distance there is between them
How does the different type of music such as classic, hiphop, or rock affect the human mind
Tectonic plates and convection cells move tectonic plates
