Contagious diffusion is wide-spread and involves interpersonal contact.
These countries are found all over the world.
Russia is in Asia.
Canada is in North America.
China is in Asia.
US is in North America.
Brazil is in South America.
Australia is in Oceania.
India is in Asia.
Argentina is in South America.
Kazakhstan is in Asia.
Sudan is in Africa.
South Africa is in Africa.
Japan is in Asia.
Germany is in Europe.
UK is in Europe.
Jamaica is in North America (or the Caribbean)
<span>between the Tigris and Euphrates rivers.......</span>
