In a longitudinal wave, the motion of the medium is parallel to the direction of the wave. This means that the particles move left and right which in turn makes the other particles start to oscillate.
The UNIA founded by Marcus Garvey has a constitution which defines red, black, and green as the Pan-African colours: red representing the noble blood that unites all people of African ancestry, the colour black for the people, green for the rich land of Africa..
For other use, see color (disambiguation) . Colored or coloured is a term used in the United States and the United Kingdom to refer to black people (i.e. , persons of sub-Saharan African ancestry; members of the black race).