False. Death Valley is not along the equator and is certainly a large desert.
There would be two answers for this question. For the reasons that it could give people an idea of what cause the regional conflict taking place and it also influences the region's political and economic decisions. Furthermore, understanding the people on both of these regions would give us a keen understanding on how they are different from us.
Contagious diffusion is wide-spread and involves interpersonal contact.