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..
In Southern Africa Cape Coloureds (Afrikaans: Kaapse Kleurling) is the name given to an ethnic group composed primarily of persons of mixed race.he term  coloured  is treated as a neutral description in Southern Africa, classifying people of mixed race ancestry. In western countries, such as the USA the term is regarded as a derogatory term: the preferred usage is  person of color .